Hatching Jamie

Mommie and I had this bedtime talk last night...

Joey: I have a pouch to carry my babies next time
Mommie: No you don't you are a mammal. Only marsupials have pouches to carry their babies.
Joey: Like kangeroos? Then what is a mammal?
Mommie: Mammals are animals which give birth to babies instead of laying eggs
Joey: Mommie you are not a mammal because you lay eggs inside your tummy and when daddie give you a seed, the egg will hatch into Jamie!