Interpretations and interpretations here comes a few...
Jesus did not poo and piss, all of what he ate was transformed in thin air (sublimation). But we can imply he had a lot of farts...
Jesus was full incorporated (mind+body) at the moment of his baptism, until that he was a kind of perfect human body running on BIOS. That's the reason why the lack of information of his youth before baptism.
Jesus possibly was delivered through Mary's ears or from a magical belly hatch! I'm not kidding, it was serious in Middle Ages!
Bonus: Mary's mother was a virgin too! I mean she was born from a virgin!