I came across this link and as a new dad found this helpful so I thought I'd share it. Priscilla Dunstan is a baby expert that seems to have cracked the baby language. She was featured on Oprah and this is the link to the YouTube video that describes the five sounds a baby makes and what those sounds mean. http://m.youtube.com/watch?v=PgkZf6jVdVg
I personally found this video very helpful.
Enjoy and I hope it makes your lives a little bit easier.