average baby boy size by month
Your baby will continue to grow rapidly during these months. The typical eight-month-old boy weighs between 17.5 and 22 pounds (8 to 10 kg). Girls tend to weigh half a pound less. By his first birthday, the average child has tripled his birth weight and is 28 to 32 inches (71 to 81 cm) tall. Head growth between eight and twelve months slows down a bit from the first six months. Typical head size at eight months is 17 1â2 inches (44.5 cm) in circumference; by one year, itâs 18 inches (46 cm).
In general, during the first six months, a baby grows about one inch per month. Between 6 months and 1 year, it slows down a bit to about a Â½ inch per month. The average height of a child at 6 months is approximately 25 Â½ inches (65 cm), and the average height of 1 year old is around 29 inches (74 cm).