One-year-old baby always crying in the middle of the night may be physiological reasons, but also may be caused by colds, rashes, rickets and other diseases. 1. Physiological factors: for example, the baby suddenly wakes up in the night, insecure, there will be crying. Or the baby is hungry, defecation and other situations, there will also be crying. 2. Pathological factors: (1) colds: after a cold, the baby may have nasal congestion, cough, fever and other symptoms, the baby in the night due to physical discomfort affects the sleep, is also the symptoms of crying. (2) Rash: If the baby’s body suffers from rash, there may be itching all over the body, which will affect the baby’s sleep and make the baby cry. (3) Rickets: if the baby has rickets, there will be excessive sweating, easy to wake up, easy to startle, and night crying. In addition to the above factors, there are many other situations that cause babies to cry at night, parents should observe the baby’s state in time, such as crying for a longer time, or recurring, it is necessary to consult a doctor in time for examination.