Just think how embarrassing this would be!:
Nurse: Here is your beautiful baby boy.
Mom: *Starry eyed* Thank you!
Dad: He look's just like you, honey!
*Doctor walks in room*
Doctor: Mrs. Turnip, we would like to inform you this is not your baby. Sorry we got mixed up. *Hands real baby and takes wrong one back*
Dad: *slowly walking out of room backwards*