If a girl is 10 and 123 pounds that obese?

The answer is yes. According to the Centers for Disease Control and Prevention (CDC), a 10-year-old girl who weighs 123 pounds is considered obese. The CDC defines obesity as having a body mass index (BMI) at or above the 95th percentile for children of the same age and sex. For a 10-year-old girl, the 95th percentile BMI is 122.2 pounds. Therefore, a 10-year-old girl who weighs 123 pounds is considered obese.