Oh ... it's the baby in the womb you are talking about. That's a really good idea!

I'd say the wish to stay inside is formed out of the retrospective of the adult ... a longing for a long forgotten real time experience but a maybe subconscious one. A protected world in which one wants to withdraw once in a while.

The happy tears of the parents the shocked cry of the baby. Many aspects in such a little text. Congrats to this accomplishment of yours.