The causes of 2-month-old infants sleeping for 6 hours in a row can be categorized into physiological and pathological, and the pathological causes include infectious diseases and systemic diseases. 1. Physiological: 2-month-old infants sleep for about 18 hours a day, so if the child sleeps without abnormal symptoms and wakes up in good spirits, this is a normal phenomenon and does not require additional special treatment. 2. Pathological: However, if there are abnormal symptoms such as cough and diarrhea after waking up, the child may be suffering from infectious diseases such as colds; if the child sleeps throughout the day, and even if the child wakes up, he/she does not have any energy, and is in a state of lethargy, he/she may be suffering from diseases such as malnutrition and anemia. If you suspect that the symptoms are pathologic, it is recommended that you go to the hospital in a timely manner.