There is some indication that babies may react to music even before they are born, but you can certainly start introducing them to music once they have arrived. You don’t need to start them off with a full symphony orchestra and loud rock bands are certainly not a good idea, but there are varied ways you can introduce music from very early on.
A very popular new baby gift is a rattle. You will probably have one or two of these and you can use them to create new and different noises for your baby. You can make sounds that repeat the rattle’s rhythm so that your baby hears you using your voice in a new way. Even if you don’t usually think you have a good singing voice, there is no need to be bothered about it as this is just between you and your baby.
While you are bathing or changing your baby, you can sing nursery rhymes or other songs and move your baby in time to the music. As you hold your baby and listen to music you can sway your body and step in time to the music. Babies will learn about music and movement from your singing and actions.