Because they had to take the mommy parts out.

Lily was spayed today. Not an easy thing to explain to a 4-year-old, but Hubby is a total genius. The title says it all. Boo took great pleasure in relaying this tidbit of information to her teacher, the lunch lady, and most of the kids at school.

I wonder what he'll say when Boo asks, "Daddy, what are mommy parts?"