How much should a 13 year old 5' 3 weigh?

Anywhere from 100 pounds to 130 pounds, there is always a range for a healthy weight. Remember that everyone is different, and not to over focus on the number, just be healthy. If you want to know more specifically about your weight range I would suggest searching "BMI for teens" but be careful to read about the site before clicking on it to make sure it will give you an accurate BMI In kilograms= around 45.5 kilos-about 60 kilos