Is it normal for a 8 year old to weigh 100 pounds?

No, it is not normal for an 8 year old to weigh 100 pounds. According to the Centers for Disease Control and Prevention (CDC), the average weight for an 8-year-old boy is between 55 and 75 pounds, and the average weight for an 8-year-old girl is between 50 and 70 pounds. A child who weighs 100 pounds at age 8 is considered overweight or obese.