In the process of caring for your baby, you suddenly notice that one of your baby’s eyes is swollen, what is going on? The following are the possible causes. 1.If it occurs after birth, the tear duct obstruction is considered to be congenital and should be carried out under the guidance of a doctor. When your baby is older, you can consider lacrimal duct irrigation to determine if the lacrimal duct is obstructed and further lacrimal duct unblocking can be performed. The eyelid skin is the thinnest part of the body, and minor edema can first manifest as eyelid edema. Common causes include allergies, mosquito bites, angioneurotic edema, tumor compression near the eyelid and orbit, lacrimal gland prolapse, and lid laxity. Systemic diseases that can cause eyelid edema include chronic nephritis, hypothyroidism, etc. 3. It may be inflammatory edema, such as conjunctivitis. Conjunctivitis has multiple causative agents, and only when the cause is identified can the cause be treated. It is recommended to use penicillin eye solution, usually pay attention to eye hygiene, available cold salt water to wash the eyes. Towels are often disinfected. Other inflammatory conditions include eyelid boils, blepharitis, and blepharitis. In conclusion, when a baby’s eye is found to be suddenly swollen one, it is recommended to take the baby to the hospital for relevant examination for the sake of the baby’s health.