There’s no law saying that baby detergent is necessary and in all likelihood, your baby will probably be fine having their clothes washed with the rest of your family’s. Making the switch to something that’s baby-friendly is more for their sake and to prevent any potential irritation, as well as avoiding exposing them to chemicals that might be in your soap already. If your baby is sensitive, reactions can include rashes, mild skin irritation, hives, or general discomfort over strong smells.