My daughter was 8 1/2 when she was diagnosed with thyroid disease. She had actually stopped growing at the age of 7. Her school picture showed this chubby little girl, she was wearing a size 12 or 14, she was tired and cold all the time. Her energy level was totally gone and she was having a hard time with her bowel movements. Her pediatrician suggested a laxative, and I kept telling her that something was wrong. She finally had blood work ordered on a Friday, by Monday they had me into Childrens hospital because her levels were so high. Her TSH levels were in the 700s and her brain function was in the 800s they were amaized that she was able to function in school at all. She then started synthroid at a low dose so not to startle her system. It's amaizing the difference, after 2 weeks we started to notice the change. After 6 months quite a change, 1year later she is thin in the face and is wearing a size 10 and some 12, she has grown 5 inches and is thinning out nicely, she is so active she might be a little to hyper right now, (I keep threatened to take her off her medicine.) Her bowels are active again and her bone scan for her growth showes her at 8 1/2. I still have to hem her pants about 6 inches but she seems to be growing into them nicely. Please keep an eye on your daughter, because it is quite amaizing what all the thyroid actually does. Good luck