Monthly babies do not sleep and cry at night can be due to inadequate feeding, baby discomfort, brain injury syndrome, calcium deficiency, disease, etc. The cause needs to be carefully identified and targeted treatment given. 1. Insufficient feeding: the baby is in a hungry state because of insufficient breastfeeding or formula feeding, which makes it difficult to sleep and often cry. Breastfeeding should pay attention to sufficient, insufficient breastfeeding can strengthen nutrition, let the baby suck more nipple to stimulate lactation. If the milk ducts are not smooth, you can ask a professional to unblock them. If formula feeding, it is necessary to pay attention to the proportion of the right concentration, the amount of milk powder is sufficient. 2. baby discomfort: such as sleeping environment temperature is too high or too low, not timely change of diapers, clothes are too tight, etc. can lead to the baby does not sleep and cry, you should carefully check the baby’s situation, the baby’s clothes should be loose and comfortable, and change the diapers diligently. 3. Brain injury syndrome: when the baby at birth there is a lack of oxygen or for preterm infants, there is a history of hypoglycemia and other medical conditions, prone to brain excitation, sleep less and limbs appear like swimming, involuntary movement increased, then you need to go to the Children’s Rehabilitation Department in a timely manner to the clinic, to give the necessary early intervention. 4. Calcium deficiency: if the baby is deficient in calcium, it can cause increased neural excitability, resulting in the phenomenon of crying. Adequate supplementation of vitamin D and calcium can promote the development of the baby’s nervous system, reduce the baby’s excitability, so that the baby will not cry at night. 5. Disease effects: when there are respiratory or congenital heart disease and other diseases, the baby is also prone to the phenomenon of crying and not sleep, and accompanied by poor milk, weak cry, and so on. Months the baby does not sleep at night crying need to go to the hospital in a timely manner to identify the cause of the treatment prescribed by the doctor.