Babies' teeth tend to arrive in a particular order: Incisors, or front teeth, on the bottom usually arrive before upper incisors, followed by the teeth immediately adjacent to those, and on back until the second molars come in.
If your baby is a late teether, there's nothing to worry about. Talk to your doctor about it if teething hasn't begun before your baby's first birthday. However, it's likely those teeth will be coming along at any moment.
Early on, your pediatrician will examine your baby's mouth during regular checkups. A dentist should see your child before his or her first birthday, or within six months of the first tooth coming in (whichever is sooner). The entire teething process may take up to two-and-a-half years, but by age 3 your toddler will likely have a full set of all 20 teeth.
Your baby may have his or her own timing for teething, but don't worry -- before you know it, you'll be saving up for braces.
Keep reading for lots more information on teething.