Annually, after a child’s third birthday, gaining more than 10 pounds each year is concerning. Generally children grow or “track” along a stable growth curve trajectory (i.e., remain in the same percentile). If a child begins to cross percentiles (“jump” from one curve to another), this becomes cause for concern. See your child’s pediatrician if you are concerned about your child’s weight. You can also use our BMI calculator as a starting point, though this is not an absolute determinant of overweight or obesity.