I am pleased to note that despite all the people who said "you'll totally stop being interested in [everything I was interested in before]", I haven't stopped being interested in other things at all -- I just have very little time/energy to do anything about most other interests (so, to try to give people the benefit of the doubt, maybe that's sort of what they meant...).

There's a subset of the "you won't be interested in [X]" crowd who just mean "You'll become a selfish bell-end as soon as you have a baby", which really means "I'm a selfish bell-end and I'm hoping people will think it's because I've had a baby".

As for the others, I don't quite know what they meant. As for myself, I never thought for a second that you'd stop being interested in stuff, but I did expect you to sort of mentally and physically check out of things for a while. I thought you'd be too wrapped up in the baby, at least for the first six weeks or so, to think about much else at all, and I was astonished when I realised you were surfing the web, checking Twitter, etc.