One dad found himself baffled by one such side-effect when he noticed something poking out of his pregnant wife's belly button. While he was amused by bizarre protrusion, it turned out it was no laughing matter... But as it turned out, the dad had to eat his words and later added:"Edit: you're right! She said it is an umbilical hernia! For the uninitiated, an umbilical hernia is a health condition where the abdominal wall behind the belly button is damaged.

Source: Daily Mirror May 26, 2018 10:52 UTC