I had to laugh yesterday, my top had ridden up whilst I was sat on the sofa (I had been half asleep and very uncomfortable it wasn't bothering me enough to sort it out), Alex came up to me and prodded my sticky out belly button (which is freaking me out...eww, I swear it didn't do that until about 8 months pregnant with Alex).
He then said "It's babies nose, is baby ready to come out now"? hehe, then "Where's the rest of it's body"? I tired to explain that it was in fact not the nose and the whole baby is in my belly, to which he replied "it's in your leg"!
I guess it's just too much for a nearly 3 year to take in, I did have a good giggle!