Full-month-old babies with yellow eye droppings are mainly considered to be caused by nasolacrimal duct hypoplasia, conjunctivitis and so on. 1. Nasolacrimal duct hypoplasia: most of the congenital nasolacrimal duct hypoplasia, resulting in tears can not be discharged smoothly through the nasolacrimal duct, and finally accumulated to form yellow eye boogers. Generally speaking, the hypoplasia of the nasolacrimal duct will gradually improve with age, and a few young children who cannot develop it on their own need to be treated. 2. Conjunctivitis: When the conjunctiva of the eye is infected with bacteria or chlamydia, purulent secretions will appear, and yellow eye droppings may also form. If it is caused by infection, there may be other symptoms such as conjunctival congestion and edema. Generally speaking, most of the yellow eye droppings in full-term babies can heal on their own. If you suspect conjunctivitis caused by infection, you should go to the hospital or clinic in time to avoid delaying the condition.