We picked up this children's book at Bookman's Used Books the other day. Each page is about how a different culture welcomes new babies into the world. I know it's a little early to start trying to get Noah ready for a new baby, but he's really into this book. Especially the page where the African village starts to sing when a baby is born (he likes to sing all day long).
Last night after I read the book to him a couple of times, he pointed to my belly and said, "Welcome baby sister?"