Watery eyes and sticky discharge are common concerns in babies and young children. One frequent cause is a blocked tear duct, medically known as congenital nasolacrimal duct obstruction. Although it can look worrying, many cases improve naturally during the first year of life.
Tears are produced by the lacrimal gland in the upper outer area of the eye. After keeping the eye surface moist, they normally drain through tiny openings at the inner corners of the eyelids, called puncta.
From there, tears pass through the nasolacrimal duct and drain into the nose. If this pathway is partially or completely blocked, tears cannot drain properly. As a result, tears collect on the eye surface and cause persistent watering
The most common cause is a thin membrane at the lower end of the tear duct that has not opened fully at birth. This is often referred to as a persistent Hasner valve membrane.
Other, less common causes may include:
Blocked tear ducts may affect one eye or both eyes. According to the source material, approximately 5 in every 100 babies may be affected, and around 90% of cases resolve spontaneously within the first year of life.
The most typical symptom is ongoing tearing, even when the child is not crying. Parents may notice tears sitting on the eyelid margin or running down the cheek.
Other possible signs include:
A blocked tear duct can cause discharge without the white part of the eye being intensely red. However, significant redness, eyelid swelling, tenderness, fever, or a child who appears unwell should be assessed promptly, as these features may indicate infection.
In many infants, a blocked tear duct opens naturally as the child grows. For this reason, the initial approach is often observation alongside proper tear duct massage, performed in the way demonstrated by the child’s eye doctor.
Treatment options may include:
A blocked tear duct can understandably worry new parents, especially when watering and discharge persist week after week, but keeping the underlying timeline in mind often brings reassurance. Most cases in newborns are simply a matter of the tear drainage pathway finishing its development, and gentle massage combined with basic eyelid hygiene is usually enough to manage symptoms in the meantime. What matters most is staying attentive to how things progress rather than assuming every case will resolve identically: a child whose discharge worsens, whose eyelid becomes swollen or tender, or whose watering is still present well past the first birthday should be seen by a pediatric ophthalmologist rather than waiting indefinitely. With appropriate monitoring, most children move through this phase without any lasting effect on their vision, and the small number who need probing typically respond well once the procedure is performed.