I Am to a girl that is 13 and is 5'8" and I went to my doctor. She said that I was at the perfect weight and should not gain or loose weight. And I weigh 115. Yep :) Glad I could help.
No less than 110, no more than 150 I am 5 8 and a half, and weigh 120, and people say I'm the perfect weight hope that helps!