I don't have experience with preemies, but i have a dcb in my care who is not a preemie and not tiny, but is 17 months and a lot like you mentioned! He isn't walking and I think it is months away still...he doesn't have any words that I have heard (except "uh-oh") and pretty much acts and looks like a 11-12 month old. I have 2 other kids who are only a month older, but about 6 months older in their behaviour. He is progressing, so I figure eventually he will catch up, but it probably comes partly from genetics and partly from his life experience at home (quite babied). Normal is a very relative term!