The eruption of teeth causes inflammation, which leads to congestion, drooling, and discomfort for child and parents. While the average time for the appearance of the first teeth is six months of age, there is a wide range before and after this that can still be considered “normal.” The teeth might come in as early as one month of age, or they may erupt when the child is one-and-a-half years old. Generally the lower front teeth come in first, and girls’ teeth typically erupt earlier than boys.