I have always assumed no, but now (with 2 months to go, so DS1 currently 18 months) I am feeling a bit bad about the shock he is going to get!
Grandma got him a baby doll and toy pushchair for christmas, and he is reasonably gentle with the doll and likes playing with it and taking its clothes on and off.
I got him a lovely book the other day ('My New Baby'), but although he loves books he couldn't care less about this one (I expect he will like it some more when the baby is here though).
He's been showing some interest in my tummy recently (more my rather unattractive tummy button I think....
), so we have said there is a baby in there, but that isn't going to make much sense to him.
His understanding and language are about average for an 18 month old boy by the way.
Any ideas? Or should I just give up! Thanks.