Pink Eye (Conjunctivitis) - Viral vs. Bacterial
The short answer
Pink eye (conjunctivitis) is very common in babies and toddlers. The three main types are: viral (most common - watery discharge, often accompanies a cold, resolves on its own), bacterial (thick yellow/green discharge, may mat the eye shut overnight, usually needs antibiotic eye drops), and allergic (itchy, watery, both eyes, seasonal). The key difference: viral conjunctivitis has watery, clear discharge while bacterial has thick, colored discharge. Both viral and bacterial are highly contagious and spread easily in daycare settings. Good hand washing is the best prevention.
By Age
What to expect by age
Eye discharge in newborns (first 28 days) is treated more seriously because it could be caused by bacteria acquired during birth, including chlamydia or gonorrhea. Any eye discharge in a newborn under 2 weeks should be seen by a doctor promptly. In older babies, pink eye often accompanies a cold (viral) or may be bacterial. A blocked tear duct (dacryostenosis) can mimic pink eye with watery discharge but the eye is typically not red. If your baby has sticky, goopy eyes without redness, it may be a blocked tear duct rather than pink eye.
Pink eye is extremely common in toddlers, especially those in daycare. Viral pink eye typically starts in one eye and may spread to the other, with watery or slightly mucousy discharge. It often accompanies a cold and resolves within 5-7 days without treatment. Bacterial pink eye causes thick yellow or green discharge, may glue the eyelids shut overnight, and usually requires antibiotic eye drops prescribed by your pediatrician. Allergic conjunctivitis causes itching, is in both eyes, and is associated with other allergy symptoms. Clean discharge with a warm, wet cloth and wash hands frequently to prevent spread.
What Should You Do?
When to take action
- Mild watery discharge from one eye during a cold (viral conjunctivitis) that resolves within a week
- Slight morning eye crustiness that cleans easily with a warm cloth
- Watery, tearing eyes in windy or cold weather
- Thick yellow or green discharge from the eye (likely bacterial - may need antibiotic drops)
- Pink eye that is not improving after 5-7 days
- Recurrent eye discharge that keeps coming back
- You are unsure whether your child needs antibiotic drops
- Eye discharge in a newborn under 2 weeks old
- Significant eye swelling with redness and fever (possible periorbital or orbital cellulitis - emergency)
- Your child cannot open the eye due to swelling (not just crusted shut from discharge)
- Vision changes or sensitivity to light
- Eye redness following an eye injury
Sources
Related Resources
Related Medical Concerns
Yellow or Green Eye Discharge in Baby
Yellow or green eye discharge in babies is very common, especially in newborns. The most frequent cause is a blocked tear duct (dacryostenosis), which affects up to 20% of newborns and usually resolves on its own by 12 months. Bacterial conjunctivitis (pink eye) is another common cause that produces thicker, more colored discharge. Simple blocked tear duct discharge tends to be milder and does not cause redness of the eye itself.
Baby Blocked Tear Duct (Watery Eye)
A blocked tear duct (dacryostenosis) is very common in newborns, affecting up to 20% of babies. It causes watery eyes and sometimes sticky discharge because tears cannot drain normally through the narrow duct into the nose. The good news is that about 90% of blocked tear ducts resolve on their own by age 12 months without any procedure.
Baby Eye Swollen, Puffy, or Red
A swollen or puffy eye in a baby can have many causes, from mild (insect bite, allergic reaction, or normal morning puffiness) to serious (periorbital or orbital cellulitis). The key distinctions are whether the swelling involves just the eyelid or the area around the eye, whether there is fever, whether the eye itself is red or has discharge, and whether the swelling came on suddenly or gradually. Eye swelling with fever always needs prompt medical evaluation.
Seasonal Allergies (Hay Fever) in Baby or Toddler
Seasonal allergies (allergic rhinitis or hay fever) are uncommon before age 2 because children need at least 1-2 seasons of pollen exposure to become sensitized. Most seasonal allergies develop between ages 2-5. Symptoms include sneezing, runny nose with clear discharge, itchy and watery eyes, nasal congestion, and the "allergic salute" (pushing the nose upward with the palm). Unlike a cold, seasonal allergies do not cause fever, and symptoms last as long as pollen exposure continues (weeks to months) rather than resolving in 7-10 days.
My Baby's Head Shape Looks Abnormal
Many babies develop temporary head shape irregularities that are completely normal. A cone-shaped head from vaginal delivery reshapes within days. Mild positional flattening (plagiocephaly) from sleeping on the back is very common and usually improves with repositioning and tummy time. However, head shape changes involving ridges, a persistently bulging fontanelle, or rapid head growth changes should be evaluated to rule out craniosynostosis.
I'm Worried About Lazy Eye (Amblyopia)
Amblyopia (lazy eye) is the most common cause of vision loss in children, affecting about 2-3% of kids. It occurs when one eye develops weaker vision because the brain favors the other eye. The tricky part is that amblyopia often has no obvious outward signs - the eye usually looks normal. Early detection through routine vision screening is critical because treatment is most effective in the first few years of life.