what is the average height and weight of a 1 year old?
As you'll see, there's now a much broader range of what's “normal” than there was at earlier ages. At fifteen months, the average girl weighs about 23 pounds (10.5 kg) and is almost 30.5 inches (77 cm) tall; the average boy weighs about 24.5 pounds (11 kg) and is 31 inches (78 cm) tall.