June baby sleep crying at night, may be gastrointestinal dysfunction, hunger, environmental discomfort, lack of calcium and so on. 1. gastrointestinal dysfunction: baby’s abdomen is cold or added complementary foods, may cause gastrointestinal dysfunction, abdominal pain, abdominal distension, etc. will cause crying. 2. Hunger: as the baby’s age increases, simple breastfeeding can not meet the needs of growth and development, the need to add complementary foods in a timely manner, the baby in the middle of the night, hunger, crying will also occur. 3. Environmental discomfort: the surrounding environment is too hot, too cold, diaper change is not timely, etc., may also cause crying in the middle of the night. 4. Calcium deficiency: 2 weeks after the birth of the baby began to supplement vitamin D, to promote the absorption of calcium and phosphorus, supplementation is not timely hypocalcemia, resulting in poor sleep, crying. According to the crying situation, you can find the cause to improve, if necessary, take the child to the hospital.