One day, years ago, I was at work checking in on the latest iTunes had to offer. One of my favorite things to do was go through the celebrity play lists. Rufus Wainwright had his up, and one of his songs was a little tune by Loudon Wainwright III called "Rufus is a T*t Man". Rufus's comment on this song was that he believed himself to be the only person with a song written about him breastfeeding. I'm still entertained when I hum it to myself. I looked it up just now on iTunes, though, and only found an acoustic version which doesn't hold the same charm as the track I originally heard and still have stuck in my head. It's got to be the most original way I've heard of for memorializing that special time in your baby's life.
While it's fine to write a song for or about your kid, I have a certain opinion about artists including their children's actual voices in their music. At least the music they sell to me. Even now, my thought on the topic of putting your baby's voice on your record is thus: please, God, no. But they all do it anyway. Everyone from Stevie Wonder to Outkast to Tool has at one time or another ruined a song for me by bringing a baby (not necessarily their own) into the studio and having that baby cry, coo, talk, or curse (ok sometimes that's funny) into the microphone, and then they think it's just so darn spectacular that they just have to work it into a song somewhere.
I can understand wanting people to think your baby is cute. I'm certainly guilty of sending out photo after photo of my own, but this whole music thing is different. With a picture, people see it, say "aw", and that's it. With a song, the baby's voice is right there every time. You're forced to hear it over and over and over again. It can be the best song in the world, but throw a kiddie giggle in there and it's ruined forever. So please, all you musicians out there with kids... stop putting your babies on your records. I believe you that they're cute. I just don't need to hear it every time I listen to "Isn't She Lovely" -- which incidentally would be a perfect song if you'd just remove that ten minute chunk of baby sounds.