When Redditor OzLebowski saw his wife's sonogram, he realized that something was horribly amiss — namely, that she was giving birth to Venom the alien symbiote from The Amazing Spider-Man comic book.
Venom's weaknesses include extreme heat and sonic blasts, so this sonogram probably did a good deal to annoy the baby extraterrestrial — this guarantees a feisty birth, complete with a requisite guest appearance by Wolverine (and maybe the Power Pack).
Once it's time for the baby to be born, the symbiote will attempt to bond with a host who enjoys eating brains. The expecting parents should therefore keep all known cannibals out of the maternity ward.