The swelling of the lower eye bags of the baby may be caused by physiological factors such as drinking too much water, lack of sleep, and may also be caused by trauma, insect bites and other reactions. 1. Physiological factors: the phenomenon of swollen bags under the eyes of the child, may be the child drinking too much water, resulting in water can not be discharged from the body in time, the normal phenomenon. It may also be caused by lack of sleep or hereditary factors, which are all normal phenomena. 2. Trauma: If the patient’s face has been hit in daily life, it will lead to platelet aggregation, which will lead to the phenomenon of swollen bags under the eyes. 3. Insect bite reaction: insect bite reaction is mainly related to insect bites, and the main symptoms of the child are chilblain-like damage, redness, swelling, erythema, blisters, and so on, and itchy, blisters and other symptoms. If the child’s eyes are bitten by mosquitoes, the phenomenon of swollen bags under the eyes will also occur. 4. Other: blepharitis, conjunctivitis, allergies, etc. can also lead to swelling under the eyes. Parents should take their children to the hospital in time and follow the doctor’s instructions when their babies have swollen bags under the eyes.