John Merritt, our 4 year old, sits in service with me 3 times a week. I think he's been listening quite a bit.
Samuel, our 1 year old, sits with me in service 2 times a week. He's more interested in crackers at this point, but he does shout "Amen" anytime we finish praying.
This is a lengthy video, but well worth the watch. If your video is choppy, pause it and let it load, then watch it without interruption. If someone can tell me how to keep it from doing that, please do!