The reasons for the sudden increase of eye droppings in the eyes of three-year-old babies include physiological factors, such as poor hand hygiene of babies; pathological factors, such as conjunctivitis, colds and so on. 1. physiological factors: due to three-year-old babies usually poor hand hygiene, when rubbing the eyes, resulting in the growth of local pathogenic bacteria, showing the above symptoms. 2. Pathological factors: the more common cause is conjunctivitis, related to infection, adverse stimuli, etc., the baby in addition to the above symptoms are also accompanied by eye redness and itching and other discomforts. Secondly, babies are also prone to sudden increase in eye boogers when they have a cold, related to bacterial or viral infections, accompanied by upper respiratory tract discomfort. Sudden increase of eye droppings in the eyes of three-year-old babies, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to determine the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.