Libby Purves, How Not To Be a Perfect Mother.
Not "inspirational" at all, instead honest, hilarious, down to earth, 100-whatever pages of sheer relief.
There is a bit about a conversation between new parents, out (at a race meeting, I think it is) where the dad wants to stay on and the mum is trying to get him to see what the consequences will be if they stay so long that the milk will run out ... I nearly cried. But instead I put it in front of dh.