The toddler’s sleeplessness and crying at night may be affected by the environment, or it may be caused by hunger, lack of calcium, gastrointestinal dysfunction, etc. The baby’s sleeplessness and crying at night may be caused by the environment. 1. Environmental changes: if the toddler sleeps in an environment that is too noisy or unfamiliar, and at a temperature that is too high or too low, it can lead to babies who do not sleep soundly at night and who love to cry. 2. Hunger: If a toddler doesn’t eat enough before going to bed, it will lead to frequent hunger at night, which will cause the toddler to sleep soundly and cry. 3. Calcium deficiency: a lack of calcium in the body can lead to increased neural excitability in toddlers, which makes toddlers easily irritable, easy to wake up, easy to cry and so on. 4. Gastrointestinal dysfunction: Eating cold and unclean food, too greasy food, resulting in gastroenteritis, indigestion, etc., but also easy to sleep at night, easy to wake up easy to cry. Young children do not sleep soundly at night, easy to wake up easy to cry, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.