Body Mass Index
A healthy 1-year-old's weight is based on nutrition, growth, gender, environment, hormones, parental size and health. The weight of a child is important, but the BMI (body mass index) is another important indicator of the child's health. A healthy child is generally within acceptable BMI limits.
Different Growth Rates
Every child grows at a different rate. Some children are born small and gain weight slowly, while other children are born heavy and gain quickly. If the child is healthy overall, then the weight should just be another consideration and not the defining health factor. If the child's growth is steady, then the medical weight charts should not be as important. Changes in eating habits and an increase in activity level can contribute to slowed growth patterns in toddlers, advises the KidsHealth website.
A healthy 1-year-old could weigh between 17 and 28 pounds. The average weight for a 1-year-old girl is 23 pounds and for a boy is 24.5 pounds, states the American Academy of Pediatrics. This is the range into which almost all 1-year-olds fall. Most 1-year-olds have tripled their birth weight and added between 9 and 11 inches to their height, according to WebMD. Examine your child's pattern of growth to make sure she is growing at a steady rate and falls in the same percentile every month.