How much should a six-month-old weigh?

All babies develop at different rates, but by the age of 6 months, a baby should have doubled his birth weight. Between birth and 6 months old, a child generally gains 1.5 to 2 pounds per month.

The median weight for a 6-month-old girl is about 16 pounds, and the median weight for a 6-month-old boy is about 17.5 pounds. However, every child grows differently, and a baby's weight gain is reliant on a number of different factors, such as genetics, diet and overall health.

A doctor can determine if a baby is a healthy weight by examining the overall growth pattern of the baby since birth.