New parents quickly learn that a sense of humor is vital to surviving the ups and downs of pregnancy and life with a newborn. So why not get in on the fun with a tongue-in-cheek "congratulations" card that adds some hilarity to one of life's most momentous occasions. Tip: we'd only send these cards to friends who will definitely be in on the joke. After all, some mamas take their babies — spit-up and all — very seriously. Keep clicking for the funniest baby cards around!