devin's mom

I am new here. I have a question about my ds who is almost 13 months. I have recently noticed that he drags his right foot when walking. He has been walking outside with little leather shoes and the right one is very scuffed. It is not totally obvious. He does not walk independantly, but will only hold on and walk. He has been pulling up and creeping for almost 4 months now, but will not walk alone. We noticed that when he crawls his left foot always gets pulled up into his pant leg. He has also leans on his right side with his arm limp from time to time while in the high chair. He ususally uses both hands, he claps, but on occassion he does not use the right arm.

He has not missed any developmental milestones, but I am worried about his lopsidedness. As a smaller infant he was constantly clenching his fists. He has always been a very tense baby. He cries and gets very angry since birth. He does not use many words... mom, dad & kitty and uses them very rarely.

I should also give some history... he was born at 36 weeks, I was induced due to preeclampsia, he had the cord around his neck and an apgar of 1. He was also ABO incompatible with janundice. He stayed in the nicu for 7 days. He was not assisted with breathing, although he "grunted" shortly after birth which is why he went to the nicu. My grandmother's brother had cerbal palsy.

Should I have him checked? Is there advantage to getting him early treatment? I don't want to be a paranoid mom (this is our first) but if there is anything I can do to help him I want to do whatever I can. What is the best frist steps?