Breastfeeding lying down can result in a circumcision. Baotian, also known as anterior anti-maxillary, is a malocclusion in which the lower front teeth bite on the labial side of the upper front teeth during orthodontics bite, with negative coverage and basically no cutting function of the front teeth. Prolonged breastfeeding, chewing stimulation causes the infant’s maxillary alveolar bone to be inhibited, while the mandibular alveolar bone is overdeveloped, forming a concave surface, resulting in the newly erupted upper and lower milk teeth appearing in anterior antomandibular condition, and may be accompanied by functional changes in the chewing muscle group. Breastfeeding is likely to cause the baby to have anterior teeth antimaxillary condition, adults should correct the habit of breastfeeding lying down, and prevent the baby from sleeping with the pacifier. In case of anterior antomandibular situation, you can wait until the baby’s milk teeth have finished erupting, and then improve the situation by wearing movable orthodontic appliances, which have the effect of inhibiting the lower jaw from extending forward and pushing the upper teeth lips forward. It is recommended to avoid the bad habit of lying down when breastfeeding, and to stop the bad habit of frequent tongue stretching, finger sucking and upper lip biting in order to prevent the occurrence of anterior antomandibular.