what is the average weight of a one year old boy
By 6 months, a boy has normally doubled in weight, and is between 25 and 27 Â½ inches long. By 1 year old, the normal size for boys is 20 to 27 lbs. and 28 to 31 inches in length. At 2 years old, the range for a normal boy begins to widen, developing a larger discrepancy between the 10th percentile and 90th percentiles.