My daughter is 21 months old and has been considered very small for her age. She currently only weighs 23 lbs and is completely off of the growth charts. We have taken her to an Endocrinologist by referral from her pediatrician. Not because she is small, but because she cannot find a spot on the growth chart and stick with it. Her height and weight are all out of wack compared to what should be "normal". We did the blood test to make sure it wasn't something like celiac, and an array of many other diseases. We also did a bone density scan that showed her growth age (by bone development) to be 7 months behind her actual age. The endocrinologist right now is just monitoring her to see how she continues to grow. Our next step is a HGH Test, which I am prolonging as long as I can. This test will tell if her pituitary gland is firing off the right amount of growth hormones (I hope that I am explaining it right). If it is not then they want to put her on Growth Hormone injection. By a treatment, I would assume this is what you are talking about. If it is then I would suggest waiting until your daughter is 4 to start injection, if she needs them at all. According to my Endocrinologist and everything I have read as long as a child starts HGH shots before or at the 4 year mark there ultimate size and growth would not be effected. So starting them at 2.5 and at 4 would be the same result, so why start a 1.5 years early? My husband and I have opted to continue to have the Endo. monitor and delay the test as long as possible to see if HGH is really what she needs.
I hope this help, and feel free to email me with any questions. I am not sure if you have seen an Endocron. but I would highly recommend it if not. Again, I do not know if this is the same situation you are experiencing or not.