Did you know that your baby is born with all 20 primary teeth? They’re just nestled below the gumline until your child is about 6 months old. The teeth begin to come through between 6 to 12 months, and most children have their full set of teeth by the time they are 3 years old. This can be an uncomfortable time for your baby, but there are several things you can do to help alleviate your baby’s pain.