Xander: Dad when i grow up, and Esmee grows up, Esmee will have a baby in her tummy and we will live in a different house and i will be the baby's daddy.
Oh the innocence! So he understands that girls have babies - and he wants to protect his sister, sooo lovely!!
We've had the question: How do babies come out of the tummy? and the resulting horrified looks.
But not yet the question of how they get in there! Thank goodness.