2-month-old children always cry in the middle of the night may be due to abdominal pain, rickets, environmental factors and so on. 1. Abdominal pain: it may be caused by functional dyspepsia and other diseases, all of which can appear abdominal pain. Because of the physical discomfort during sleep, the phenomenon of crying in the middle of the night can occur. 2. Rickets: it is a kind of chronic disease mainly characterized by bone lesions caused by abnormal calcium and phosphorus metabolism and ossification disorder due to various factors. It is mainly caused by vitamin D deficiency, and children can have night terrors, excessive sweating and other symptoms. Therefore, the phenomenon that a 2-month-old child always cries in the middle of the night can occur. 3. Environmental factors: it may be due to the noisy sleeping environment, too high or too low temperature and other reasons, which affects the quality of the child’s sleep. Thus, the child is unhappy and cries in the middle of the night. It is recommended that 2-month-olds who always cry in the middle of the night go to the hospital in time and follow the doctor’s instructions for treatment to avoid delaying the condition.