4 months baby sleep is not solid easy to wake up crying can be seen in environmental factors, nutritional vitamin D deficiency, gastrointestinal disorders and other conditions, intervention according to specific analysis. 1. Environmental factors: If the indoor temperature is too high or too low, the baby appears uncomfortable, the above symptoms may occur, need to adjust the indoor temperature as appropriate. 2. Nutritional vitamin D deficiency: such as nutritional vitamin D deficiency rickets, in the early stages of the disease, there may be increased neurological excitability, such as irritability, irritability and restlessness, such children need to be evaluated by specialists to guide the daily care, such as appropriate sun exposure, and supplementation of vitamin D in the appropriate dose. 3. Gastrointestinal dysfunction: these babies may have abdominal discomfort, may be accompanied by frequent spitting up, etc. With the above symptoms, dietary adjustments should be made as appropriate, and if necessary, oral administration of Sifu Tang oral solution may be taken to relieve the symptoms. 4. Other: If the baby is hungry at night, the baby may not sleep soundly and wake up easily, and need to strengthen the feeding symptoms. The above drugs should be used under the guidance of specialists, baby sleep is not solid easy to wake up crying more causes, if necessary, it is recommended to actively seek medical attention, by the specialist assessment and judgment to be intervened.