| | Diet & Nutrition | Postpartum Weight Loss Average weight of a 8 11 year old girl? According to the Centers for Disease Control and Prevention (CDC), the average weight for girls aged 8 to 11 years is between 58 and 110 pounds. Postpartum Weight Loss - Related Articles How to Reduce Weight After a C-Section Average weight 7 year old boy? Why do you always get ill when lose weight? What is the average weight for a ten year old boy in 1997? How much is a 6-year-old boy supposed to weigh? Ways to Reduce Weight After Childbirth What is the average weight of a 2 girl?