The baby’s eyes are suddenly swollen for the following two main reasons: First, angioneurotic edema, which is caused by allergies, the child may be exposed to certain allergic substances due to this situation, the baby needs to be given oral anti-allergy drugs, such as ketotifen, loratadine or cetirizine, etc., and if necessary, the baby also needs to be given hormones orally. Second, it may be related to infection, the baby rubbed his eyes after touching something dirty with his hands, thus causing eye infection, this situation needs to be treated with eye drops, you can use tobramycin eye drops. If the symptoms do not improve, you need to go to the ophthalmology department immediately.