14-week-old baby filmed clapping in its mother's womb

Some commenters were quick to call the video fake, but Cardinal told TODAY that while her doctor manipulated the footage to extend the applause, the first three claps were indeed "very real."

“We went for an ultrasound. Our baby clapped two or three times. We gasped, laughed," she said. "Doctor said, 'let's sing a song.' He rewound and replayed it to us singing, so it looks like the baby is clapping. Great fun.”

A spokesperson for the American College of Obstetricians and Gynecologists told TODAY.com that it's plausible the baby did clap at least once, explaining, "Fetuses make all sorts of meaningless movements in utero without knowing that they are doing it — but if the clapping movement is real, it only happened once and they probably edited it to repeat."

Watch the video above to see the musical moment for yourself — and if you missed it, check outthis ultrasound image that shows a tyke flashing a thumbs-up sign, dubbed the “Fonzie fetus,” after Henry Winkler's character on “Happy Days."

Video: http://www.today.com/parents/ultrasound-video-shows-baby-clapping-mom-sings-if-youre-happy-2D80574882?cid=sm_fbn