A 2 year old baby crying at bedtime may be caused by uncomfortable environment, colic, calcium deficiency and other conditions. 1. uncomfortable environment: if the sleeping environment is too noisy, too hot, too cold and other circumstances lead to the 2-year-old baby can not fall asleep, there may be a cry at bedtime. 2. Colic: Colic caused by the 2-year-old baby’s digestive system is not yet well developed, or a large amount of air in the stomach during breastfeeding, etc., may also cause the 2-year-old baby to cry and fuss when it comes to bedtime. 3. Calcium deficiency: If the 2-year-old baby’s body is deficient in calcium, it may cause the nervous system to become more excitable, and symptoms such as not easy to fall asleep at night, night crying, irritability, night sweats (sweating abnormally after going to sleep, and waking up after the sweating stops) may occur. 2-year-old babies cry when they go to sleep, there may also 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, under the guidance of the doctor to give targeted treatment or treatment.