I have a three year old that is short for her age too.  she was bron with cah sw.  Right know she is the same hight as one and one and a half year olds.  They say that her levels are fine and she is doing fine we get her tested every three months.  In  the fall they are going to do the bone age growth to lets us know what age her bones are.  Hoping she will take a growing spot soon.