When a woman gets pregnant, the body goes through some pretty impressive changes as it adapts for the growing baby.
One of those changes is with the belly button. Many women will experience their innie naval becoming an outtie sometime in the second or third trimester as the uterus pushes the abdomen forward.
However, this pregnant woman has the ability to pop out her belly button into what sort of looks like a balloon, thanks to her umbilical hernia from a previous pregnancy.
Pretty neat. Also, kinda gross.