Acute conjunctivitis in infants may be caused by external environmental influences, bacterial infections, viral infections and other factors. 1. External environmental influences: outdoor environment is not good, there are wind and sandy weather, parents take infants out, may cause eye irritation, it is easy to make infants develop acute conjunctivitis. 2. Bacterial infection: Parents do not take good care of their babies in daily life, and babies often rub their eyes with dirty hands, which may lead to bacterial infection of the conjunctiva, and then acute conjunctivitis is easily caused. 3. Viral infections: Infants with other viral infections may have conjunctival infections via the blood or lymphatic route, which can easily lead to viral acute conjunctivitis. When infants have symptoms of acute conjunctivitis, parents should take their children to the doctor for examination and treatment in time to avoid adverse effects.