Is a 5.3 year old boy that weighs 115 pounds fat?

Obesity depends on the height as well as the weight. If the boy is excessively tall for his age, he may not be. The average height and weight for a 5 year old boy is 40 inches tall and 41.8 lbs. 115 lbs is the average weight for a child approximately 14 years of age and 64 inches tall. While no claim to obesity can be made without knowing his height, chances are he is very overweight.