According to the baby’s growth pattern, 3 months head up, 4 months can have roll over action, 7 months can consciously roll over, in the supine position and prone position between back and forth. The baby’s development can generally have a month or so of difference, 4 and a half months the baby is slow to turn over, may belong to the normal situation, but can not rule out the existence of abnormal conditions: common causes 1, weak constitution: breastfeeding is not enough, the baby lacks nutrition, muscle, bone development is not perfect, unable to support the turning movement, or the baby is overweight, turning over difficulties. It is recommended to feed reasonably, supplement vitamin AD, promote the absorption of calcium, parents should also be appropriate to give help, conducive to the baby’s flexibility to turn over; 2, developmental delay: such as perinatal ischemia, hypoxia, there can be a delay in the development of the baby, resulting in a delay in the turn over of the situation. Parents are advised to pay attention to whether the baby is accompanied by other conditions, such as whether he/she laughs out loud, plays with his/her own hands, or whether he/she cries and laughs more consciously. If there exists a big difference with babies of the same age, it is recommended to go to the hospital for a physical examination in time to understand the baby’s developmental status; 3. Other factors: babies’ developmental cycles are not all the same, which may be related to the baby’s inactivity, too much clothing and so on. Pay attention to observe the baby’s specific situation, such as diet, defecation, mental state, generally can be with the growth of the age of the month, and gradually learn to turn over, stand up, walk. Treatment 1, supplemental nutrition: appropriate addition of complementary foods, such as milk powder, eggs, or follow the doctor’s instructions to take vitamin D, calcium, etc.; 2, exercise: parents to help the baby turn over or use toys to guide the baby, is conducive to the baby’s rapid learning; 3, the treatment of the underlying disease: it is recommended to visit the doctor for examination and clarification of the disease, and targeted treatment. Precautions Although there are individualized differences in the growth and development of babies, there is a general pattern to be found, so once the baby’s development is far behind that of babies of the same age, it is necessary to remain vigilant and seek medical attention in a timely manner.