Eyelid swelling in toddlers can be caused by lack of sleep, mosquito bites, infections and other reasons. 1. Lack of sleep: when young children do not have enough sleep, it will cause poor blood circulation around the eyes, resulting in localized fluid pooling around the eyes, which will lead to the symptoms of eyelid swelling in young children, and some infants will also appear to cry. 2. Mosquito bites: young children sleep at night if you do not do a good job of young children’s care, resulting in mosquito bites, there will be infants and young children eyelid swelling, while infants will also appear to scratch the symptoms of the eye. 3. Infection: frequent rubbing of the eyes with dirty hands can cause infection by bacteria and other pathogens, leading to blepharitis and other diseases, which in turn cause eyelid swelling. If a baby’s eyelids are swollen all the time, it is important to pay attention to it and go to the hospital in time.