"If You're Happy and You Know It", clap your hands! That's exactly what this baby appears to be doing in this ultrasound video going viral on YouTube today. 

The video that is racking up millions of views is making moms and the occasional dad say "awwwww". It really is adorable, even more so when the doc rewinds and fast forwards the footage to make it look like it's clapping along to a familiar song.