Mom, What's a Fetus?

Curtis watched Breaking Dawn with me the other night, 2nd time he has seen it and he just asked, 'mom, what exactly is a FETUS?' 

So I told him that it is what doctors call a baby while it is in utero (yes he understood what that meant). So he asked why 'Alice' from the movie kept calling the baby "The Fetus". I told him that when a mom is only so far pregnant that is what the doctors call it and plus on the movie no one wanted to call it a Baby because they were not sure what it was. It's fantasy and he knows that as well so he understood why they didn't know.

So since he was asking about baby's and fetus' I went to this website and we looked through the Fetus photos week by week. He thought that was pretty cool.