The eruption of the first tooth varies, but generally occurs around 6-8 months, although it can vary from 6 months onwards. Some babies may be born with teeth or have them erupt during the first month of life, while others may not have teeth until 16 months. The important thing is symmetry: if a tooth erupts on one side, the tooth on the opposite side should erupt shortly after. In some cases, the lateral incisors may erupt before the central incisors, which is normal.