How to Calculate & Formula Details
Mathematical Model Formula
Weight Gained = Current Weight - Birth Weight. Average Gain per Week = Weight Gained / Weeks Since Birth.Newborns typically lose a small amount of weight in their first days, then gain steadily. This calculator tracks total weight gained since birth and compares your baby's average weekly gain to a typical benchmark.
Typical Newborn Weight Gain
In the first few months, healthy newborns typically gain about 5 to 7 ounces (roughly 150 to 200 grams) per week, though this varies by feeding method, birth weight, and individual growth patterns.