One and a half year old children have a lot of yellow and sticky eye boogers may be caused by dacryocystitis, conjunctivitis, keratitis and other reasons. 1. Dacryocystitis: When the nasolacrimal duct is narrowed or blocked, the tears will be retained in the lacrimal sac, which will easily induce bacterial infection, resulting in inflammation of the lacrimal sac area, mucous or mucopurulent secretions, which will make one and a half year old children have the symptom of heavy, yellow and sticky eye boogers. 2. Conjunctivitis: when children often rub their eyes with dirty hands, causing bacterial infection of the conjunctiva, there will be red eyes, photophobia, tearing, and more eye discharge, which will make the children’s eye boogers become more frequent, and they are also yellow and sticky. 3. Keratitis: when viruses, bacteria and other pathogenic microorganisms attack the cornea of the child, it will induce keratitis, resulting in eyelid spasm, photophobia, tearing, pus discharge from the eyes and other discomforts, so that the child will have more eye droppings and yellow and sticky. When a one-and-a-half year old child’s eye boogers are yellow and sticky, parents should immediately take the child to the hospital for an examination to determine the cause of the disease and follow the doctor’s instructions to avoid delaying the disease.