We've always been very matter-of-fact with Tyler when it comes to body parts and nudity.  He knows that mommy has boobies and that he and daddy have "pee-pees".  He also knows that a bra is something that hold boobies.  

So I was in walmart with him last weekend, shopping for some underpants for myself.  I let him get out of the cart, telling him that he needed to stay right there in that same aisle with me.  Next thing I know, as I am pawing through the packages of underwear looking for the ones I want, I hear this squeaky little toddler voice chanting "boobies! boobies! boobies!"  I turn around, and Tyler had taken a bra off the rack and was marching around, holding it up to his chest while telling the whole world "boobies"!