If your baby has a favorite song, you can easily turn it into a sing along.  By doing this, you will show your baby all or some of the words while you sing it.  You can do this through your computer using a program like Power Point to type the words to your song.  You can also do this by using sentence strips.  These are available at office supply stores and come in packs of 100 for under $5.00.  You can begin with just the chorus if you like.  You can stick the words up on your refrigerator with some magnets and when you and your baby sing, point to each word.   Who says that babies are too young for Karaoke?