We were able to actually record the babies using the bottle as a shaker and playing other instruments to make some of the song's tracks. We had so much fun making this because we were surrounded by such cuteness. The parents and babies were fantastic!
The song was written by Deborah Pardes and she originally created all the tracks used to inspire the kids performances. That's her playing the ukulele in the video. Here's her site - http://www.mentlmusic.com/