Hi, my son is 29 months and I have been noticing that when he gets excited he stands on his tippy toes and flaps his hands like a bird. Also he walks on his tippy toes alot. He is usually a pretty happy guy. But I am concerned because his speech is a little behind, even though he comprehends what we say very well. He has even picked up on sign language. I guess my question is, should I seek help, or is there an exact diagnosis for my child, or am I just being a worry wart.