Questions?
You may one day ask, "Daddy, if our universes are like soft drink bubbles, what is the soft drink itself?"

Oh my little one, my budding astronomer, my petite philosopher, good question. If the universes are the little bubbles that tickle your nose, then the soft drink itself is the firmament in which we live and move and have our being...

I suppose next you'll want to know why the sky is blue? It's all about light waves traveling through the atmosphere. I'll explain later.