I have always suspected that Charlie understands more language than he lets on. He has this musical book with a dozen songs that you can play on the built in piano. We look through it and sing the songs together. The first time he cried when we sang "Rock-a-bye baby" I figured he had caught his finger somewhere. When he did it the next time, I realized he was very upset about the baby falling out of the tree. So now I make up different words the song - something about the birds carrying the baby in his basket. So far, he has been fine about Humpty Dumpty falling off the wall, so I have been spared making up an even goofier song about an egg.
Here we go round the plum tree