Every baby is unique, and just like any other milestone, there will be natural differences in timing from one child to the next. The two lower front teeth usually begin to erupt about six months of age, followed by the four upper teeth, and then the rest of the teeth erupt in pairs, one on each side of the mouth. Before a child reaches the age of three, he or she will have a total of 20 baby teeth. On average, children should have four teeth by 11 months, eight teeth by 15 months, 12 teeth by 19 months, 16 teeth by 23 months, and 20 teeth by 27 months. Teeth may come in slightly later and this is usually perfectly fine, but if the eruption pattern is abnormal or no teeth have erupted by the age of 18 months, we may diagnose it as delayed tooth eruption. This isn't a dental condition or a disorder; it's just a way of describing what's going on with your child's teeth.