My 3-year-old and Iwere looking through a photo album of him from when he was born and at first he had trouble reconciling the fact that the pictures were of HIM.  Once he got past that, he became quite intrigued and had lots of questions, as 3-year-olds do.  At the very end of the photo album were pictures of the ultrasound.  After explaining that those were pictures of him when he was in my belly, he (of course) asked how he got in there to start with.  I answered that with the “well it’s very special how you got in there” and was relieved when he seemed to accept that.  Then he thought about it a minute and asked me, “Well where are the pictures of THAT?!?!”