my son is about 6 months now, and I feel as if he is already behind. I worked full time for the first 5 months, so he went back and forth between my mothers house and ours. Now, I'm a stay at home mom, and I have to basically teach him every thing. He can't hold his bottle on his own.. Cannot sit up all the way by himself, still working at crawling, and we just now got a good bedtime schedule going. Is this normal? I'm sure he should be doing at least some of this on his own.