The fontanel closes too early at 8 months, you can observe the baby’s head circumference, if the head circumference is at the normal level, you can temporarily observe the follow-up treatment, but if the head circumference is significantly smaller than normal babies, you need to be vigilant about the possibility of microcephaly, it is possible that the child’s brain development will be affected. Under normal circumstances, the fontanel should close around 12-24 months of age. If the fontanel closes too early and the head circumference is small, it is likely to lead to insufficient brain capacity, affecting the normal growth and development of the brain, and the child may suffer from mental retardation, motor dysfunction, etc., which must be taken seriously by parents. However, if the baby’s head circumference is normal, it can be temporarily observed and followed up, if necessary, under the guidance of the doctor to improve the cranial MRI and other tests to clarify the craniocerebral situation. If the 8-month-old baby fontanel closure, and head circumference is abnormal, it is recommended that parents should take the child to the hospital as soon as possible to the Department of Child Health. Many children’s fontanelles close too early, considering that it may be related to the body’s lack of calcium, vitamin D, etc., if there is any abnormality can be targeted under the guidance of the doctor to deal with.