Well, yes, it is kind of normal to have mucus for newborn. And for newborn baby, it can be impossible eye problem. But on the other hand, it actually occurs. Generally speaking, when the external eye structures become irritated, triggering an inflammatory response, eye mucus can be possible.  For the causes, bacterial eye infections, allergies and abnormal tear production or content can just be common ones. So we can say that it can be very dangerous to have eye mucus.  But on the other hand, mucus in newborn’s eyes can disappear by itself with time. So you do not need to worry about it. And it still exists, medical care is needed.