Gryffindor: I'll tell you when you're older.

Hufflepuff: A bird brings them in a blanket.

Slytherin: Se- *Ravenclaw covers Slytherin's mouth

Ravenclaw: Well, daddy has a sperm cell, mommy has an egg cell when they combine, it forms a baby, mommy carries the baby in her stomach for 9 to 10 months, and then the baby is born!