Haven't read the responses, but one negative jumps out at me.

The judgement. Every single parenting call you make is wrong and there are thousands of old ladies out there ready to tell you. From sling/pram, breast/bottle, sleep routines, healthcare, using creches, going for coffee, working/staying at home, weaning, cloth/disposable nappies, what you eat and drink... it is endless and stupid. Even now DS is at school, there is still the judgement from people who have never met us before and will never see us again. (However, few people say things to me directly, I generate an aura of "I am prepared to tell you why you're stupid" or something. So I find out later from DH or friends.)

Most people expect sleepless nights and a period of adjustment. I didn't expect the nastiness and plain weirdness of comments from strangers, especially old ladies.