Babies crying and not sleeping at night may be caused by too noisy surroundings, bloating caused by eating too much, rickets, etc. They can be improved by changing the surroundings, improving bloating, taking vitamin D and calcium orally. 1. Improve the surrounding environment: babies sleep in a noisy environment, which is not conducive to the child’s sleep, you can let the child sleep in a quieter environment, the light is not too bright, and the quilt is not too thick. 2. Improve bloating: babies who eat too much food before going to sleep are prone to bloating and abdominal pain, leading to crying in the night. This situation needs to adjust the diet, do not let the child eat too much food before bedtime. Or massage the abdomen in clockwise direction, and take oral intestinal probiotics such as Bifidobacterium bifidum to relieve abdominal discomfort if necessary. 3. Oral vitamin D and calcium: Vitamin D and calcium deficiency can also cause babies to cry and not sleep, you can take appropriate oral vitamin D and calcium to improve the habit of babies crying at night. There may be other reasons why a baby cries at night, so it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.