It is normal for a 4-month-old baby to have teeth. There are two sets of teeth in a person’s life, the first set of teeth is called milk teeth, a total of 20, usually in the first 4-10 months after birth, 13 months after birth has not yet erupted, known as delayed teething. The second set of teeth, called permanent teeth, has 28-32 teeth in total and usually starts to change around 6 years old. When a child’s milk teeth erupt, the first two incisors begin to emerge, either the upper or lower teeth, then the other two incisors come in, followed by the molars, and then the tiger teeth. The timing of teething varies from child to child. If your child does not start teething by the time he or she is about 1 year old, don’t worry. The timing of teething may be genetically determined, so late teething does not mean that there is a developmental problem. Teething may cause excessive drooling and a tendency to chew on hard objects, in addition to mild allergies, crying, and a low fever that does not rise above 38 degrees. The gums around the new teeth usually become swollen and tender, so try gently rubbing your finger against his or her dental bed to relieve the pain.