Torticollis in babies is most often caused by tightening or shortening of a neck muscle called the sternocleidomastoid (SCM), which runs along each side of the neck. This is called congenital muscular torticollis, and it’s the most common form. But several other conditions can also make a baby tilt or turn their head to one side, ranging from acid reflux to eye alignment problems to rare skeletal abnormalities.
Congenital Muscular Torticollis
The most frequent cause is a problem with the SCM muscle itself. The leading theories point to crowding in the womb, reduced blood supply to the muscle during development, or trauma during delivery. When a baby is packed tightly in the uterus, especially in breech position or in a multiple pregnancy, the neck muscle can be compressed or stretched in a way that causes it to shorten or tighten on one side. The result: the baby is born with a head that tilts toward the tight muscle and rotates away from it.
In some cases, a small lump forms in the muscle itself. This benign mass, sometimes called a sternocleidomastoid tumor of infancy, typically appears between the second and fourth week of life, measures a couple of centimeters across, and is usually on the right side. It feels firm to the touch and sits within the muscle. Despite the alarming name, it’s not cancerous and generally resolves on its own or with stretching.
How Physical Therapy Affects Outcomes
Timing matters significantly with congenital muscular torticollis. When physical therapy begins before one month of age, 98% of babies achieve full range of motion in about six weeks. Starting between one and three months still yields strong results, with 89% reaching normal motion after about six months of treatment. Wait until three to six months, and the success rate drops to 62%, with treatment taking around seven months. These numbers make a strong case for early evaluation if you notice your baby consistently favoring one side.
Treatment typically involves guided stretching exercises, repositioning during sleep and feeding, and encouraging the baby to look toward the restricted side using toys or voices. Most babies respond well without needing anything beyond this.
Acid Reflux and Sandifer Syndrome
Not all head tilting in babies comes from a muscle problem. Sandifer syndrome is a condition where severe acid reflux triggers unusual body movements that can look a lot like torticollis. Babies with this condition arch their backs, jerk their bodies, or twist their necks in response to stomach contents moving up the esophagus. It’s essentially a pain reflex, similar to pulling your hand away from a hot surface. The baby’s nervous system reacts to the burning sensation by contorting the body into positions that seem to relieve discomfort.
The key difference from muscular torticollis is that these episodes come and go, often around feeding times, rather than being constant. Treating the underlying reflux typically resolves the abnormal posturing.
Eye Alignment Problems
Babies can also tilt their heads to compensate for a vision issue, particularly a condition called congenital superior oblique palsy. This involves weakness in one of the muscles that controls vertical eye movement. When that muscle doesn’t work properly, the eyes don’t align correctly, and the baby tilts their head to fuse the two images into one and avoid seeing double.
This is frequently misdiagnosed as muscular torticollis in young children with a persistent head tilt. Research has documented babies as young as two weeks old using a head or body lean to compensate for this kind of eye misalignment, meaning the visual system is already actively processing and correcting for the problem almost from birth. One documented case showed an infant who consistently leaned to the right when sitting or being held, using gravity to tilt her head into a position that aligned her vision. If stretching and repositioning aren’t improving a baby’s head tilt, an eye exam is an important next step.
Skeletal Abnormalities
In rarer cases, the torticollis stems from the bones themselves. Klippel-Feil syndrome is a condition where two or more vertebrae in the neck are fused together from birth. This fusion restricts movement and can cause involuntary tensing of the neck muscles, pulling the head into a tilt or turn. Children with this condition may also experience chronic headaches and muscle pain as they grow. Because the limitation is structural rather than muscular, this type of torticollis won’t respond to stretching exercises and typically requires imaging to diagnose.
Neurological Causes
Benign paroxysmal torticollis of infancy is a rare neurological condition that causes recurring episodes of head tilting. Unlike muscular torticollis, which is constant, these episodes come in waves. During an episode, a baby may tilt their head to one side and also show irritability, paleness, vomiting, drowsiness, or poor coordination. Episodes can begin anytime from birth through early childhood and tend to resolve on their own as the child gets older. The condition is considered a precursor to migraines and shares some of the same underlying mechanisms.
More serious neurological causes, such as tumors in the brain or spinal cord, are uncommon but worth considering when a baby develops torticollis suddenly after a period of normal head movement, especially if other neurological symptoms are present.
How to Tell the Difference
The pattern of the head tilt offers the biggest clue to its cause. A baby born with a consistent tilt to one side, possibly with a small neck lump, almost certainly has congenital muscular torticollis. A head tilt that comes and goes around feeding suggests reflux. Episodes that appear and disappear with other symptoms like vomiting or drowsiness point toward a neurological cause. A tilt that doesn’t improve with months of stretching raises the possibility of an eye or skeletal issue.
Pediatricians can usually identify muscular torticollis through a physical exam, feeling for tightness or a mass in the SCM. If the cause isn’t clear, imaging of the neck or an eye exam can help distinguish between the less common possibilities. The vast majority of babies with torticollis have the muscular form, and the vast majority of those respond well to early treatment.