A 30-day-old baby who does not sleep and cries at night needs to look for the cause, which may be due to the external environment, or indigestion, lack of nutrients and so on. Treatment should be chosen according to the specific cause. 1. External environment: if the baby sleeps at night in a bright environment, the temperature is too high, can lead to the baby does not sleep, crying, should be adjusted in time to the external environment, so that the baby is in a quiet, comfortable environment to sleep, to maintain the appropriate temperature, and so on. 2. Indigestion. If eating improperly or the abdomen is cold easily appear indigestion symptoms, appear at night crying, can massage the baby’s abdomen, can be used with the use of bifidobacteria and other treatments. 3. Lack of nutrients: night crying also need to consider is calcium deficiency, can supplement vitamin D, calcium, and actively take the baby sun supplement calcium, but need to pay attention to the time to go out; can be given vitamin D supplement. It is recommended that patients seek medical attention in a timely manner, the above drugs should be used under the guidance of a doctor, while actively looking for the cause of the disease, targeted treatment.