Infants and ritual is a far cry from what we adults do for ritual. You can certainly expose your baby to ritual by bringing them inside the Circle when you hold them. You can also light candles and dim the lights to your baby's room in order to get them used to that as well. Babies, especially newborns respond very well to candlelight and it is a good experience for them to have.
Another thing to try is lighting incense. Unless you use very potent scents, or your child has allergies, you should definitely give them experience with new scents. Try a different scent everyday so that your baby will become familiar with them, and be comfortable with new smells.
