Although the baby did not actually clap seven times like the video shows, "the experience is one I'll never forget, the baby clapped three times, then the doctor rewound and scrubbed it while we sang," Cardinal added in a Youtube comment. "No mystery. It was amazing."
The pair chose to sing "If You're Happy and You Know It"—an appropriate choice. Cardinal's unbelievable video already has more than 100,000 views.
This baby is happy and knows it!
And this isn't the first time an unborn baby was already getting attention. We can't forget Snooki's sonogram featuring her lipstick-applying daughter!
Caitlin St John is an Editorial Assistant for Parents.com who splits her time between New York City and her hometown on Long Island. She's a self-proclaimed foodie who loves dancing and anything to do with her baby nephew. Follow her on Twitter: @CAITYstjohn
Image: Ultrasound via Shutterstock