Question: what is the average height of a 6 month old baby girl?
Answer: 1﻿ Between six months and one year, that growth slows down a bit to about a 1/2 inch per month. The average length of a baby boy at six months is approximately 26 1/2 inches (67.6 cm) and a baby girl is about 25 3/4 inches (65.7 cm).