Baby Growth Calculators: Feeding, Development & Traits

Explore calculators for feeding, growth, developmental milestones, and inherited traits. Nutrition Needs for Infants Under 1 Year and Infant Feeding Volume help parents and caregivers estimate feeding needs. Child Height and Weight offers a way to review growth measurements, while the Child Development Tracker helps you follow age-related milestones. Curious about inherited features? Baby Eye Color explores possible outcomes based on parental eye colors. These tools offer estimates and general guidance, not a diagnosis or a substitute for advice from your child’s healthcare professional.

Nutrition Needs for Infants Under 1 Year

Estimate an infant’s weight, length, and daily energy and nutrient amounts from birth weight, birth length, and age in months.

Child Height and Weight

Compare a child’s height and weight with age- and sex-specific reference ranges from birth to 5 years. Enter their age, weight, and height to see categories and a growth chart; this calculator does not report exact percentiles.

Infant Feeding Volume

Estimate an infant’s daily feeding volume, feedings per day, and a sample schedule. Enter age in months, feeding type, weight in grams, and an optional first feeding time.

Child Development Tracker

Select your child’s sex and age to see reference weight and height values. The calculator also asks for birth weight and birth height, but these do not change the results.

Corrected Age

Enter your baby's birth date and gestational age at birth to find the corrected (adjusted) age on any date. This tool subtracts the weeks your baby was born early from the chronological age.

Formula Powder

Work out exactly how much water and how many scoops of formula powder you need to prepare one bottle or a whole day's worth. Enter the bottle volume, number of bottles and the mixing ratio from your formula can.

Baby Eye Color

Select both parents’ eye colors to see the calculator’s two lookup-table outcomes. These are simplified illustrations, not reliable probabilities for your baby’s eye color.

Infant Growth Velocity

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.

Apgar Score

Score a newborn's condition at 1 and 5 minutes after birth using the five Apgar signs: Appearance, Pulse, Grimace, Activity and Respiration. Select a value from 0 to 2 for each sign and get the total score with its interpretation.

Fetal Weight Estimate

Estimate fetal weight from three routine ultrasound measurements — head circumference, abdominal circumference and femur length — using the Hadlock formula. Enter values in mm or cm and get the result in grams, kilograms and pounds.

Newborn Weight Loss

Enter your baby's birth weight and current weight to see how many grams (or pounds) and what percentage of birth weight your newborn has lost or gained, and whether the change is within the normal range.