A baby’s 20 primary teeth are already present in the jaws at birth and typically begin to appear when a baby is between 6 months and 1 year. Most children have a full set of 20 primary teeth by the time they are 3. Being proactive about your child’s health today can help keep his or her smile healthy for life. Dental decay in baby teeth can lead to crowding in the adult teeth and can affect the growth of the jaw, which is why regular appointments are important to monitor development. It is also extremely imperative to talk with your dentist and pediatrician if your child snores or chronically breathes through his or her mouth, since this also can affect the growth of the jaw and size of the airway.