You’d be surprised it happens a lot
When I was young in NZ there was a story in the newspaper of a girl about 15 who was fat and pregnant who went to the bathroom at the Saturday matinee at the movie theatre and gave birth to her live full term baby (alone) she stuck her gum in the baby’s mouth to quieten it, wrapped it in a towel tucked the bundle under her arm, and went back inside the theatre, standing at the back to watch the rest of the show...I cant remember what happened after that or if the baby died but at that time it was a shocking thing...