One thing to watch out for and I speak from very bitter experience is a "belly". If they suddenly start to get a "belly" get them checked out please. This happened with one of my girls, she was 13years old and suddenly started to gain weight fast. She was always a very good eater and seemed to be eating even more than usual, so we just thought she was getting a bit greedy and chubby. It wasn't, it was actually fluid around her heart and the start of heart failure. It wasn't until she started fainting that we realized she had problems.
