My 16 month old baby has a green-yellowish discharge on her eye. What could it be?

Eye infection. Eye infections could be caused by bacterial, fungus or virus and thus have different treatments. You need to take your baby to see a doctor for proper diagnosis/ treatment. Some common eye infections are pink eye , trachoma, blepharitis. Trachoma if not properly treated may lead to blindness. Some eye infections may be contagious (wash hands often), some may last for days or weeks. Take care.