my DS is nearly 4 and liked to pretend to be pregnant during my pregnancy. even now he still says he's pregnant sometimes - like the other day he told my mum he can't run at the park becaus he has a baby in his tummy! he also insists he's a girl, which gets kinda irritating... but the way i see it, i'm his primary role model until he moves into the world of school etc. and it's logical that he wants to be like me. at this age some kids live very much in their imaginations and that is quite normal.