A child’s crying at night can be caused by various reasons, including hunger, overeating, a wet diaper, tight clothing, thick blankets, skin itching, abdominal bloating and pain, low humidity in the environment, and being startled. By checking the baby’s diet, diapers, clothing, bedding, and environmental humidity, and providing appropriate treatments such as adjusting the diet, changing the diaper, wearing comfortable clothing, using a humidifier, and taking symptomatic anti-inflammatory medication orally, the baby’s sleep condition can be improved.