A 16-day-old baby who is not sleeping soundly may be caused by a poor sleeping environment, improper diet, micronutrient deficiency, gastrointestinal dysfunction and so on. It is necessary to go to the hospital in time to determine the cause of the disease and treat the cause. Common causes and care measures 1, poor sleep environment: the weather is too cold or too hot, the sleep environment is not quiet enough, uncomfortable sleeping position and other factors can lead to the symptoms of the child do not sleep soundly. Create a good sleeping environment for the baby, pay attention to the room temperature at 22-26 ℃, avoid noise, bed sheets should be changed in time, and adjust the sleeping posture appropriately; 2, improper diet: children with too much or too little breastfeeding can lead to the symptom of not sleeping soundly. Attention should be paid to adjust the child’s intake, 16 days of infants daily intake of total milk about 150ml/kg can be; 3, micronutrient deficiencies: children lack of vitamin D or calcium deficiency, etc., may lead to sleep. At this time, it is generally not recommended to use drugs, can be used to supplement vitamins and calcium milk powder, such as the symptoms are serious, it is recommended to consult a doctor; 4, gastrointestinal dysfunction: gastrointestinal dysfunction of the child, can be caused by abdominal pain and discomfort lead to sleep. At this time, you can use massage techniques to help massage the child’s stomach, promote gastrointestinal peristalsis, improve gastrointestinal dysfunction symptoms.