My 2 Year Old Daughter Has Thin Hair That Isn’t Growing

My 2 year old daughter hair is very very thin and will not grow it has been the same length for a year. I am very concerned for her hair what should I do? Is this a medical problem or is there something I can do to make it thicker?

If you are correct, you need to start with her pediatrician. I can not make any suggestions without appropriate testing.