Planets

Ciara was asking me what the names of the planets were and I was trying to teach her her the My very efficient mother just served us nine pizzas... planets.  So I said  my starts with m, what planet starts with m.... and we went through the letters.  We got to u and she said, "Wait a minute don't tell me".  She thought for a minute and said, "Uterus".  Too many "momma gotta baby in her tummy movies" for this little girl, ya think?????