{"id":66446,"date":"2026-10-06T10:31:05","date_gmt":"2026-10-06T07:31:05","guid":{"rendered":"https:\/\/wpcalc.com\/en\/?p=66446"},"modified":"2026-10-06T10:31:05","modified_gmt":"2026-10-06T07:31:05","slug":"infant-growth-velocity-calculator","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/en\/pregnancy-baby\/infant-growth-velocity-calculator\/","title":{"rendered":"Infant Growth Velocity Calculator"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Track Your Baby&#039;s Growth Rate Between Checkups<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"66446\" data-favorite-title=\"Infant Growth Velocity\" data-favorite-url=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/infant-growth-velocity-calculator\/\" data-favorite-excerpt=\"Calculate your baby&#039;s growth velocity: enter two weighings (and optional lengths) with their dates to get weight gain per day and per week, plus length gain per month.\" aria-label=\"Add to Favorites\" data-favorite-icon=\"icon icon-children\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/infant-growth-velocity-calculator\/\" method=\"POST\" class=\"calculator\" id=\"calculator-66446\" data-post=\"66446\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Input Fields<\/legend><div class=\"is-single field\" id=\"input-1\"><span class=\"font-semibold\">First measurement<\/span><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-2\">Date of first weighing<\/label><div class=\"term\">d\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"date\" name=\"date_of_first_weighing\" id=\"field-2\" aria-describedby=\"calc-info-2\" step=\"any\" value=\"2025-06-01\"\/><small id=\"calc-info-2\">Earlier checkup or home weighing<\/small><\/div><div class=\"field has-term\" id=\"input-3\"><label for=\"field-3\">Weight<\/label><div class=\"term\">W\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"weight\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"300\" max=\"20000\" value=\"3200\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unit\" aria-label=\"Unit\"><option value=\"g\" selected>g<\/option><option value=\"kg\">kg<\/option><option value=\"lb\">lb<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-3\">Baby&#039;s weight on the first date<\/small><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-5\">Length (optional)<\/label><div class=\"term\">L\u2081<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"length_optional\" id=\"field-5\" aria-describedby=\"calc-info-5\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"20\" max=\"120\" value=\"50\"\/><div class=\"grid grid-cols-1\"><select id=\"field-6\" name=\"unit\" aria-label=\"Unit\"><option value=\"cm\" selected>cm<\/option><option value=\"in\">in<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-5\">Head-to-heel length; leave empty if not measured<\/small><\/div><div class=\"is-single field\" id=\"input-5\"><span class=\"font-semibold\">Second measurement<\/span><\/div><div class=\"field has-term\" id=\"input-6\"><label for=\"field-8\">Date of second weighing<\/label><div class=\"term\">d\u2082<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><input type=\"date\" name=\"date_of_second_weighing\" id=\"field-8\" aria-describedby=\"calc-info-8\" step=\"any\" value=\"2025-06-29\"\/><small id=\"calc-info-8\">Later checkup or home weighing<\/small><\/div><div class=\"field has-term\" id=\"input-7\"><label for=\"field-9\">Weight<\/label><div class=\"term\">W\u2082<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"weight\" id=\"field-9\" aria-describedby=\"calc-info-9\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"300\" max=\"20000\" value=\"3900\"\/><div class=\"grid grid-cols-1\"><select id=\"field-10\" name=\"unit\" aria-label=\"Unit\"><option value=\"g\" selected>g<\/option><option value=\"kg\">kg<\/option><option value=\"lb\">lb<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-9\">Baby&#039;s weight on the second date<\/small><\/div><div class=\"field has-term\" id=\"input-8\"><label for=\"field-11\">Length (optional)<\/label><div class=\"term\">L\u2082<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"length_optional\" id=\"field-11\" aria-describedby=\"calc-info-11\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"20\" max=\"120\" value=\"51.5\"\/><div class=\"grid grid-cols-1\"><select id=\"field-12\" name=\"unit\" aria-label=\"Unit\"><option value=\"cm\" selected>cm<\/option><option value=\"in\">in<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-11\">Head-to-heel length; leave empty if not measured<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Re-Calculate\" id=\"calculate-button\" data-post=\"66446\">Calculate<\/button><button type=\"reset\">Reset<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calculate automatically<\/label><small>If enabled, the result will update automatically when you change any value.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Growth Velocity Results<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>Time between measurements<\/span><span class=\"result-term\">\u0394d<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-2\"><span class=\"field-title\"><span>Total weight change<\/span><span class=\"result-term\">\u0394W<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-3\"><span class=\"field-title\"><span>Weight gain per day<\/span><span class=\"result-term\">g\/day<\/span><\/span><span class=\"field-value\" id=\"result-3\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-4\"><span class=\"field-title\"><span>Weight gain per week<\/span><span class=\"result-term\">g\/week<\/span><\/span><span class=\"field-value\" id=\"result-4\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result\" id=\"output-5\"><span class=\"field-title\"><span>Length gain per month<\/span><span class=\"result-term\">cm\/mo<\/span><\/span><span class=\"field-value\" id=\"result-5\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-6\"><span class=\"field-title\"><span>What this means<\/span><\/span><span class=\"field-value\" id=\"result-6\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copy Result\" aria-label=\"Copy Result\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copy link to this calculation<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Leave a Comment<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"66446\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">How did this result make you feel?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Like <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">Helpful <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confused <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Disappointed <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Inaccurate <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>Infant Growth Velocity Formula<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">Formula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ \\Delta d = d_2 - d_1 \\]\n\\[ v_W = \\frac{W_2 - W_1}{\\Delta d} \\quad \\text{(g\/day)} \\qquad v_{W,\\,week} = 7 \\cdot v_W \\]\n\\[ v_L = \\frac{L_2 - L_1}{\\Delta d \/ 30.4375} \\quad \\text{(cm\/month)} \\]<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Where:<\/strong><\/p>\n<ul>\n<li>\\(d_1, d_2\\) \u2014 the dates of the first and second measurement (days)<\/li>\n<li>\\(\\Delta d\\) \u2014 the number of days between the two measurements<\/li>\n<li>\\(W_1, W_2\\) \u2014 the baby's weight on each date, converted to grams (kg \\(\\times 1000\\), lb \\(\\times 453.592\\))<\/li>\n<li>\\(L_1, L_2\\) \u2014 the head-to-heel length on each date, converted to centimeters (in \\(\\times 2.54\\))<\/li>\n<li>\\(v_W\\) \u2014 weight velocity, i.e. average weight change per day<\/li>\n<li>\\(v_L\\) \u2014 length velocity, i.e. average length change per month (30.4375 days is the average month length)<\/li>\n<\/ul>\n<p>These formulas express growth as a <em>rate<\/em> \u2014 how fast weight and length change over time \u2014 rather than as a single measurement. That makes it possible to compare a baby's growth across checkups of different lengths.<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-459\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>Infant Growth Velocity \u2013 Calculation Example<\/h2><\/div>\r\n\r\n<p>{example}<\/p>\n<p><strong>Example:<\/strong> a baby weighed 3200 g and measured 50 cm on June 1, 2025. Four weeks later, on June 29, 2025, the baby weighed 3900 g and measured 51.5 cm.<\/p>\n<p>\\[ \\Delta d = 28 \\text{ days} \\]<\/p>\n<p>\\[ \\Delta W = 3900 - 3200 = 700 \\text{ g} \\]<\/p>\n<p>\\[ v_W = \\frac{700}{28} = 25 \\text{ g\/day}, \\quad v_{W,\\,week} = 25 \\times 7 = 175 \\text{ g\/week} \\]<\/p>\n<p>\\[ v_L = \\frac{51.5 - 50}{28 \/ 30.4375} = \\frac{1.5}{0.9197} \\approx 1.63 \\text{ cm\/month} \\]<\/p>\n<p><strong>Result:<\/strong> the baby gained an average of 25 g\/day (175 g\/week) and grew about 1.63 cm\/month over the 28-day interval.<\/p>\n<p>{\/example}<\/p>\n\r\n<\/section>\n<h2>How to Use the Calculator<\/h2>\n<ol>\n<li>Enter the <strong>Date of first weighing<\/strong> \u2014 the earlier checkup or home weighing.<\/li>\n<li>Type the baby's <strong>Weight<\/strong> on that date and pick the unit (g, kg or lb) from the dropdown.<\/li>\n<li>If length was measured, fill in <strong>Length (optional)<\/strong> in cm or in; leave it empty if not measured.<\/li>\n<li>Enter the <strong>Date of second weighing<\/strong>, the <strong>Weight<\/strong> (with its unit) and, optionally, the <strong>Length<\/strong> from the later measurement.<\/li>\n<li>Read the results: time between measurements, total weight change, weight gain per day and per week, length gain per month, and a short interpretation against typical WHO-based ranges.<\/li>\n<\/ol>\n<h2>What Is Infant Growth Velocity?<\/h2>\n<p>Growth velocity is the <em>speed<\/em> at which a baby grows \u2014 grams per day for weight, centimeters per month for length. A single weighing only tells you how big the baby is <em>now<\/em>; velocity tells you whether growth is on track between visits. Two babies can sit at the same percentile while growing at very different rates, which is why pediatricians look at both the trend and the absolute value.<\/p>\n<p>Velocity is especially useful in the first weeks and months, when weight changes are fast and small absolute differences matter. For healthy term infants, WHO growth standards suggest typical weight gains of about <strong>25\u201330 g\/day<\/strong> in months 0\u20133, <strong>15\u201320 g\/day<\/strong> in months 3\u20136, <strong>10\u201313 g\/day<\/strong> in months 6\u20139 and <strong>7\u20139 g\/day<\/strong> in months 9\u201312. Length typically increases by about <strong>3\u20134 cm\/month<\/strong> in months 0\u20133, then about <strong>2 cm\/month<\/strong> in months 3\u20136 and <strong>1.2\u20131.5 cm\/month<\/strong> in months 6\u201312.<\/p>\n<p>When you interpret your result, compare it with the range for your baby's <em>age bracket<\/em>, not with a single fixed number. A rate of 20 g\/day is excellent for a 5-month-old but would be low for a 2-week-old. Also remember that a healthy rate over one interval does not need to be maximal \u2014 steady, sustained growth along the baby's own curve is the goal.<\/p>\n<h2>Assumptions, Limitations and Practical Tips<\/h2>\n<ul>\n<li><strong>Use intervals of at least 2\u20134 weeks.<\/strong> Over very short intervals, normal daily fluctuations (feeding, wet diapers, scales differences) can dominate the result and make it misleading.<\/li>\n<li><strong>Weigh consistently.<\/strong> Use the same scale when possible, at a similar time of day, without clothes or diaper. Differences between clinic and home scales can easily reach 50\u2013100 g.<\/li>\n<li><strong>Length is harder to measure than weight.<\/strong> Length velocity from two measurements is only meaningful if both were taken carefully, head-to-heel, with the baby lying flat.<\/li>\n<li>The calculator assumes term infants. For premature babies, growth targets depend on <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/premature-baby-corrected-age-calculator\/\">corrected age<\/a>, so discuss the numbers with your pediatrician.<\/li>\n<li>A negative result (weight loss) is common in the first days of life; see our <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/newborn-weight-loss-percentage-calculator\/\">Newborn Weight Loss Calculator<\/a> for that stage. Later, small dips during illness can happen, but continued decline deserves a prompt check-in with your pediatrician.<\/li>\n<li>This calculator does not replace growth charts or medical advice. Your pediatrician plots weight and length on WHO\/CDC percentile curves at every visit \u2014 see also our <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/childs-height-and-weight-chart\/\">Child Height and Weight chart<\/a> for the bigger picture.<\/li>\n<li>If you are unsure whether feeding volumes are adequate, the <a href=\"https:\/\/wpcalc.com\/en\/pregnancy-baby\/infant-feeding-volume\/\">Infant Feeding Volume Calculator<\/a> can help you check typical intake for your baby's weight.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Calculate your baby's growth velocity: enter two weighings (and optional lengths) with their dates to get weight gain per day and per week, plus length gain per month.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[45],"tags":[18],"class_list":["post-66446","post","type-post","status-publish","format-standard","hentry","category-pregnancy-baby","tag-baby-growth-genetics"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/comments?post=66446"}],"version-history":[{"count":1,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66446\/revisions"}],"predecessor-version":[{"id":66447,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/posts\/66446\/revisions\/66447"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/media?parent=66446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/categories?post=66446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/en\/wp-json\/wp\/v2\/tags?post=66446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}