Pink Mom MathBaby Weight Gain Calculator
Enter birth weight, current age, and current weight to see your baby's gain rate and how it compares to the expected growth trajectory.
How Baby Weight Gain Is Tracked
This calculator computes your baby's total weight gain since birth and computes the daily and weekly rate, then plots your baby's trajectory against the WHO/CDC 50th percentile expected curve.
The expected curve shows the median (50th percentile) weight at each age from WHO data (birth to 23 months) and CDC data (24–36 months). Your baby's actual point is plotted at their current age to show the comparison.
A baby whose weight consistently tracks below the expected curve is not necessarily a concern if they are growing at a steady rate. What matters most is a consistent, upward trend — not matching the median exactly.
Frequently Asked Questions
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Related Guides
Reading Your Baby's Growth Chart: WHO vs CDC Standards
How to read a pediatric growth chart, when WHO vs CDC standards apply, what percentile ranges are healthy, and how to interpret your baby weight and length measurements.
Baby Growth Percentiles Explained
What baby growth percentiles mean, why ranking matters less than consistent tracking, when a drop in percentile needs evaluation, and how to use percentile data.
Predicting Your Child's Adult Height
The Tanner midparental height formula, genetic potential ranges, growth velocity patterns, and factors that influence a child's final adult height.
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Normal breastfeeding intake ranges by age, how supply adapts to demand, signs of adequate intake, common concerns about milk supply, and when to consult a lactation consultant.
This calculator provides estimates for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider with questions about your health or your baby's health.
WHO Child Growth Standards (2006) / CDC Growth Charts (2000, revised). Weight gain rates are reference values — individual variation is normal. Consult your pediatrician with any concerns.