But Where's the Mute Button?

Nate of Fighting In A Sack and his wife bought us a onesie for our baby on the way, I put a picture below.

I've never heard of the place before that they got this from, it's Ipop My Baby. Not sure why it's Ipop and not Ipod, but both ipopmybaby.com and ipodmybaby.com take you there.