R.T.
I'm with you. We used to "do it" 3-5 times a week. Then we had our daughter (now 16 months old) and we're down to once, maybe twice a week. And not because I want to, but because I feel I have to. I blame my method of birth control, but really, I'm distracted and TIRED!
I agree with the other responder- I think our husbands should count themselves lucky. I know a lot of other moms of young children, and most report having sex once every 2-4 weeks!
I think you and I are normal, given the circumstances. I'm 31.