Most of them are physiological phenomena, which are normal and parents should not worry about them. A few may be pathological phenomena, including lack of calcium and delayed motor development in addition to cerebral palsy. Parents need to take their children to the hospital for head MRI, EEG and other examinations in time to clarify the diagnosis and then treat the symptoms. I. Physiological phenomena: each baby has individual differences in development, some babies are a little late in physical development, 8 months unstable sitting may be a normal phenomenon. Pathological phenomena: 1. Cerebral palsy: If there is cerebral palsy, in addition to delayed movement development, it can also be accompanied by abnormal development of intelligence, language and epilepsy. For babies with cerebral palsy accompanied by epilepsy, they can be treated with Benzedrine hydrochloride tablets as prescribed by the doctor, and can also be treated by selective spinal nerve heel resection surgery. 2. Lack of calcium: When babies lack calcium, they are prone to unstable sitting, restless sleep, night awakening and poor appetite. Calcium supplements, such as vitamin D and cod liver oil, can be taken under the guidance of a doctor. It can also be supplemented by adding calcium-rich supplements, such as eggs and mushrooms. Parents should often take their babies to the sun and ensure sufficient sleep; 3, motor development delay: common in infants and toddlers, caused by perinatal brain injury, congenital genetics, peripheral nerve damage, etc.. The symptoms are softness or hardness of the body, reduced activity, abnormal head circumference, and slow reaction. Parents need to take their babies to the growth and development department or growth and development center of a regular hospital for consultation and treatment with oral calcium tablets under the guidance of a professional doctor, and massage the baby’s muscles appropriately to relieve the symptoms. Parents should usually encourage their babies to practice crawling and sitting to strengthen their mobility. Note: In general, a normal baby can turn over at 2-3 months, sit and crawl at 5-6 months, and stand with support at 9 months. Although there are individual differences in the development level of different babies, parents need to pay attention to the activities of their babies at each time point in order to be able to detect problems as early as possible.