The AAP recommends adding fluoride to your baby's diet at 6 months to help prevent tooth decay by hardening the enamel of the teeth. Fluoride can often be found in tap water, which your baby can take from a sippy or straw cup as soon as they begin eating solids, but the cleanliness of your water source will vary by city, so make sure to check that the water is safe to drink before giving it to your child. Your pediatrician can help you to determine whether the water in your area contains adequate fluoride, or if supplements are necessary. Bottled water generally does not contain fluoride.
You can also ask your pediatrician or pediatric dentist about fluoride varnish, which is often recommended once the baby's teeth have come in.
