The 3 Bears

I was scooping porridge into the bowls for the girls when this conversation took place.

Louisa: Where are we going now?
Roslyn: We're not going anywhere. It's time for lunch.
Louisa: Let's be the 3 bears
Roslyn: (wondering what she's talking about)
Louisa: The porridge is still hot. Let's go for a walk! Goldilocks will come.
Roslyn: (laugh out loud)