Three-year-old babies who do not eat and are drowsy may be caused by pathological reasons such as hypoglycemia, respiratory tract infections, or physiological factors. 1. hypoglycemia: babies with hypoglycemia have low blood sugar levels, but the brain needs to utilize blood sugar to do its work, so the brain will suffer from insufficient oxygen supply and get tired easily, leading to drowsiness. 2. respiratory tract infection: acute inflammation of the nose, throat or larynx caused by bacteria or viruses, the patient may have symptoms of fever, and the baby will not love to eat and have symptoms of drowsiness. 3. physiological factors: may be due to the baby play too tired or sleep deprivation caused by the baby, it will appear to eat more sleepy, the phenomenon of drowsiness. Three-year-old babies do not eat sleepy may also be seen in the nervous system infection, indigestion and other diseases, if the symptoms of three-year-old babies do not eat sleepy, persistent and unrelieved, need to promptly seek medical treatment.