Baby Crossed Eyes (Strabismus)
The short answer
It is common for newborns' eyes to occasionally cross or wander during the first 3-4 months as their eye muscles strengthen and coordination develops. This intermittent crossing usually resolves on its own. However, if one eye consistently turns in, out, up, or down after 4 months, or if crossing is constant at any age, it should be evaluated by a pediatric ophthalmologist.
This is one of the most common questions parents ask. Searching for answers means you care.
By Age
What to expect by age
0-3 months
Intermittent eye crossing in newborns is very common and usually not a cause for concern. Babies are still developing the coordination between their eye muscles and brain. Many babies also have pseudostrabismus, where a wide nasal bridge or prominent skin folds make the eyes appear crossed when they are actually aligned. True constant crossing at any age, however, should be evaluated.
3-6 months
By 4 months, a baby's eyes should be consistently aligned and able to track objects smoothly together. If crossing is still occurring regularly after 4 months, a referral to a pediatric ophthalmologist is recommended. Early detection is important because untreated strabismus can lead to amblyopia (lazy eye), where the brain starts to ignore signals from the misaligned eye.
6-12 months
Any persistent eye misalignment at this age needs evaluation. Treatment depends on the type and cause of strabismus and may include glasses, patching the stronger eye to strengthen the weaker one, or in some cases, surgery to adjust the eye muscles. The earlier treatment begins, the better the outcomes for visual development.
12 months+
Some children develop strabismus (particularly intermittent exotropia, where an eye turns outward) after infancy. New onset eye turning at any age should be evaluated. Children do not outgrow true strabismus, and early treatment is important for developing normal binocular vision and preventing permanent vision loss in the affected eye.
What Should You Do?
When to take action
- Brief, intermittent crossing in a baby under 3-4 months old that comes and goes and is not constant
- Your baby's eyes appear slightly crossed due to a wide, flat nasal bridge (pseudostrabismus), but actually track together normally
- Both eyes move together smoothly to follow objects or faces after 3-4 months of age
- Your baby makes good eye contact and visually tracks objects across their field of vision
- Your baby's eyes are still intermittently crossing after 4 months of age
- You notice one eye consistently drifts inward, outward, upward, or downward while the other looks straight ahead
- Your baby seems to tilt or turn their head consistently to one side when looking at things
- You are not sure whether your baby's eyes are truly misaligned or if it is pseudostrabismus from their facial features
- One eye is constantly turned in a different direction from the other at any age, as this indicates true strabismus requiring prompt evaluation to prevent vision loss
- Your baby develops a sudden new eye turn, especially if accompanied by a head tilt, eye swelling, or the pupil appears white in photographs instead of the normal red reflex
Sources
Related Resources
Trust your instincts. If something feels wrong, reach out to your pediatrician.
Worrying about your baby means you care. That is a good thing.
Related Medical Concerns
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.
Achondroplasia (Dwarfism) in Babies
Achondroplasia is the most common form of short-limbed dwarfism, affecting about 1 in 15,000 to 40,000 births. It is caused by a mutation in the FGFR3 gene and is usually apparent at birth with characteristic features including short limbs, a larger head, and a prominent forehead. Intelligence is normal. With monitoring for specific complications and supportive care, children with achondroplasia lead full, active, and independent lives.
Adenoid Hypertrophy and Breathing
Adenoids are lymphoid tissue located behind the nose that help fight infection in young children. When adenoids become enlarged (adenoid hypertrophy), they can block the nasal airway, causing chronic mouth breathing, snoring, nasal speech, and sleep-disordered breathing. Enlarged adenoids are most common between ages 2-7 and are a leading cause of obstructive sleep apnea in young children. Treatment ranges from watchful waiting and nasal steroids to surgical removal (adenoidectomy) if breathing or sleep is significantly affected.
How to Advocate for Your Child's Needs
You know your child better than anyone, and your observations matter. If you feel something is not right with your child's development or health, you have every right to ask questions, request evaluations, and seek second opinions. Advocating for your child is not being difficult - it is being a good parent.
Air Quality and Baby Health
Babies and young children are more vulnerable to air pollution than adults because they breathe faster, their lungs are still developing, and they spend more time close to the ground where some pollutants concentrate. The EPA recommends keeping babies indoors when the Air Quality Index (AQI) exceeds 100 (orange level). During wildfire smoke events, keep windows closed, use air purifiers with HEPA filters, and monitor your child for coughing, wheezing, or difficulty breathing. Long-term exposure to air pollution can affect lung development.
Altitude Sickness in Babies
Babies and toddlers can experience altitude sickness when traveling above 5,000-8,000 feet (1,500-2,500 meters). Symptoms are harder to recognize in infants because they cannot describe how they feel. Watch for unusual fussiness, poor feeding, disrupted sleep, vomiting, and fast breathing. Gradual ascent is the best prevention. Most pediatricians recommend avoiding sleeping at very high altitudes (above 8,000 feet) with infants when possible, and descending immediately if symptoms appear.