Question: what is the average weight and height for a nine month old?
Answer: 9-Month-Old Baby Weight & Length We know you're wondering: How much should a 9-month-old weigh? Average weight for a 9-month-old baby is 18.1 pounds for girls and 19.6 pounds for boys. Average length is 27.6 inches for girls and 28.3 inches for boys, according to the World Health Organization.