Most babies appear these phenomena, are normal physiological state. Mainly related to these factors: the baby’s nervous system development is not perfect, the baby grows too fast, the baby deep sleep, shallow sleep period conversion. According to the baby’s situation, can be divided into the following reasons: 1, covered too thick or wear too thick: children sleep as much as possible to choose light clothing, so that the child’s living environment to pay attention to warmth, the temperature should be controlled at about 20 degrees, the relative humidity should be at about 60%. 2, lack of some elements: lack of trace elements and calcium, zinc, etc., will also lead to the baby sleep less stable at night, you can go to the blood test some body trace elements and other content, if the lack of timely supplementation to improve the baby sleep. 3, lack of security: lack of security is also one of the important reasons why babies wake up. For such a baby, parents can let him sleep in a relatively small space, but also should pay attention to the sleep environment, such as letting the baby sleep in a fixed bed, use fixed bedding, listen to fixed music, etc., so that the baby’s psychological sense of security. 4, the nervous system and respiratory system is not well developed: the newborn baby’s nervous and respiratory system is still in a tender state, the baby is disturbed by the external environment, the sudden movement affects the baby, so the baby will sleep unconsciously grunting and shaking phenomenon, which parents do not need to worry too much, let the baby slowly adapt to the environment on it. 5, the growth process of the normal phenomenon: small babies in infancy is the fastest development, the body will unconsciously produce a variety of actions when sleeping, such as grunting and rolling over, so encounter this situation, parents should not be too worried.