Sleepiness of 2-month-old babies can be seen in physiological phenomena, pathological conditions (such as hypoglycemia, neurological diseases, sepsis, etc.). 1. Physiological phenomenon: For babies in this age group who sleep for a long time, such as a long period of time without rest for various reasons, and then may appear to sleep more, and at the same time the general condition is good, no obvious abnormal symptoms, is a normal physiological phenomenon. 2. Pathological conditions: (1) Hypoglycemia: when the baby is not fed for a long time, hypoglycemia may occur, and sleepiness may appear, and usually the baby responds poorly. (2) neurological diseases: such as intracranial hemorrhage, can be caused by late-onset vitamin K₁ deficiency, can be manifested as lethargy, often poor mental response, can be accompanied by convulsive symptoms. (3) Septicemia: If sepsis occurs in severe infections (e.g., severe pneumonia caused by bacterial infection), lethargy can occur, often accompanied by fever symptoms. 2 months baby sleepiness, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.