Eight months baby above the incisors spacing is likely to be due to the development of the jawbone caused by the normal phenomenon, there may also be due to the upper lip tie attachment is too low, there may be due to sparse teeth caused by. 1. Physiological factors: eight months of the baby’s growth and development is more vigorous, the baby’s body is developing at the same time the face of the skull is also developing, the jawbone also belongs to the face of the skull, so the jawbone grows and has been erupted teeth can not be synchronized with the growth of the baby’s incisors will lead to eight months of the baby appeared on the upper incisors spaced out a lot of performance. 2. Upper lip tie attachment is too low: eight months baby above the incisors spacing is very large, may be due to the baby’s upper lip tie attachment is too low, which leads to the child’s upper door teeth gap can not be completely closed. 3. Sparse teeth: the amount of teeth is too small, congenital missing teeth and other reasons can lead to the baby’s teeth sparse, this situation will also make the eight-month-old baby appeared on the upper incisor spacing is very large performance. After eliminating physiological factors, if the symptoms of eight-month-old babies with large spacing between the upper incisors continue to be unrelieved, it is recommended to consult a doctor in time to find out the cause and ask the doctor to deal with it.