Whether it is normal for a child to have two teeth at one year old depends on whether the child has other symptoms, and cannot be generalized. Generally speaking, children will start to erupt milk teeth around 4-10 months old, but due to individual differences, developmental speed, etc., they may start to grow teeth only around one year old, which is usually normal if there are no other abnormal symptoms. If a child develops a cockscomb, which means that the sternum is convex, the ankles and wrists are distended, and the bones of the lower limbs are deformed and bent in an X- or O-shape, it may be caused by rickets. If the child has a dull expression, swollen face, low body temperature, etc., it may be caused by rickets. Rickets is caused by the child’s vitamin D deficiency, causing disorders of calcium and phosphorus metabolism, and cretinism is caused by low thyroid function. When the above symptoms occur, the growth of two teeth may be abnormal. When this condition occurs, you can go to the dental department to take dental films to see if the root development is normal, or go to the pediatric department to check the trace elements, according to the doctor’s guidance, give the child appropriate calcium supplementation, etc., and pay attention to the child’s oral hygiene.