Are you fat if you are 12 years old and you have a small belly hang?

If you have small belly hang, it does not mean your fat. The average weight for a 12 year old is 80 to 100 lbs. If you are more or less than that it doesn't mean your fat, or too skinny, it just means you should watch what you do and eat, so you don't become unhealthy later. Having a small belly hang is normal, just don't let it turn into something that could be a problem.