The baby always jumping may be caused by the imperfect development of the nervous system, lack of security and calcium deficiency. 1. imperfect development of the nervous system: due to the imperfect development of the baby’s nervous system, the cerebral cortex is very immature, the excitability of the central nervous system is relatively high, it is easy to cause the baby always jumping phenomenon. 2. Lack of security: after the birth of the baby, the baby did not have a sense of security in the uterus, the activities of the arms can not touch the uterine wall, may be frightened to cause jumping performance. 3. Calcium deficiency: when the baby lacks calcium, it will lead to an increase in the excitability of the nervous system, which will cause the baby to jump all the time, accompanied by symptoms such as restlessness, baldness and excessive sweating. When the baby is always jumping and accompanied by uncomfortable symptoms, should go to the hospital in time, and according to the cause of treatment.