Helmet therapy is a treatment that uses a custom-fitted helmet to gently guide an infant’s skull into a more symmetrical shape as the baby grows. The helmet doesn’t squeeze or reshape the head with force. Instead, it works by making contact with the areas of the skull that bulge outward while leaving open space over the flattened areas, directing natural growth into that gap. Treatment typically lasts 14 to 18 weeks and works best when started between 5 and 6 months of age.
How the Helmet Actually Works
A baby’s skull is made of soft, flexible bone plates that grow rapidly during the first year of life. A cranial remolding helmet takes advantage of that growth window. The inside of the helmet is shaped to sit snugly against the parts of the skull that protrude too far while creating small gaps where the head is flat. As the brain grows and pushes the skull outward, bone fills in where there’s room to expand. No external pressure is applied to compress the skull. The helmet simply channels growth in the right direction.
Each helmet is custom-made from a 3D scan or mold of the baby’s head, and the orthotist (the specialist who builds and fits the device) adjusts it periodically as the skull changes shape and the baby grows.
Conditions That Helmet Therapy Treats
The most common reason for helmet therapy is positional (deformational) skull flattening, which happens when a baby spends too much time lying with pressure on one part of the head. This includes two main patterns:
- Plagiocephaly: flattening on one side of the back of the head, often giving the head a parallelogram shape when viewed from above.
- Brachycephaly: flattening across the entire back of the head, making the skull unusually wide and short.
These positional deformities are not caused by fused skull bones. They result from external pressure, whether from sleeping position, time in car seats, or limited neck mobility (torticollis) that keeps the baby favoring one side.
Helmet therapy is also used after surgery for craniosynostosis, a condition where one or more of the skull’s growth seams fuse too early. In these cases, a surgeon first opens the fused seam through a minimally invasive procedure, and the helmet is worn afterward to maintain the correction and prevent the deformity from returning. Post-surgical helmets have shown particularly good results for facial asymmetry, though improvements in forehead shape can take time and may not reach the same level as more extensive surgical approaches.
When to Start and Why Timing Matters
The ideal window to begin helmet therapy is at 5 to 6 months of age. Babies who start in that range see faster correction and better final results. In one study comparing infants who started at 5 to 6 months versus those who started later, the earlier group completed treatment in about 14 weeks compared to 18 weeks for the later group. More importantly, the younger babies achieved a normal level of skull symmetry, while the older group did not fully normalize.
The relative improvement in asymmetry was 75.3% for the younger group versus 60.6% for the older group, and the difference was visible within the first 4 to 11 weeks of treatment. This is why many specialists now recommend starting helmet therapy alongside physical therapy in severe cases rather than waiting to see if repositioning alone works first.
By about 12 months, the skull bones begin to thicken and growth slows considerably, narrowing the window for effective correction. Most providers won’t initiate helmet therapy much past that point.
Helmet Therapy vs. Repositioning
Not every baby with a flat spot needs a helmet. Conservative treatment, which includes repositioning (varying the direction the baby faces during sleep and awake time) and physical therapy for tight neck muscles, resolves the problem for many infants. In a large study of over 4,300 babies evaluated for positional skull deformities, 77.1% of those treated conservatively achieved complete correction without ever needing a helmet.
However, 15.8% of the conservative group eventually transitioned to a helmet after repositioning didn’t work, and 7.1% ended up with incomplete correction. Among babies who wore a helmet as their first treatment, 94.4% achieved complete correction. Babies who switched to a helmet after failed conservative therapy did equally well, with a 96.1% complete correction rate.
The takeaway: repositioning works for most mild to moderate cases, but a helmet is significantly more reliable for achieving full correction, especially when the deformity is severe or not improving with repositioning alone.
What Daily Life Looks Like
The helmet needs to be worn 23 hours a day. The only time it comes off is for bathing. Your baby wears it while sleeping, feeding, and playing. That sounds intense, but most infants adjust within a few days. The helmet is lightweight, and babies this young adapt quickly to new sensations.
Parents visit the orthotist regularly throughout treatment so the helmet can be adjusted as the baby’s head grows. These visits also let the provider monitor progress and make sure the helmet still fits correctly.
Skin Care and Hygiene
The most common issue parents encounter is minor skin irritation, often from heat and moisture trapped under the helmet. Serious complications are extremely rare, but mild redness, sweating, and odor are normal parts of the process. Keeping the helmet clean by wiping it out daily with rubbing alcohol or soap and water, and checking your baby’s skin each time you remove the helmet for a bath, goes a long way. Good helmet hygiene is the single most effective strategy for minimizing skin problems.
Cost and Insurance Coverage
Cranial remolding helmets typically cost between $1,300 and $4,000. That price usually includes the helmet itself, the initial scan or mold, and all follow-up adjustment visits.
Insurance coverage varies widely. Some private plans cover the cost, but many require detailed documentation that the helmet is medically necessary rather than cosmetic. Getting that distinction coded properly on the claim makes a significant difference. Medicaid covers cranial helmets in some states but not all, and eligibility requirements differ by location. TRICARE, the military health plan, only covers helmets for babies who have had craniosynostosis surgery and still have a misshapen skull afterward. It does not cover helmets for positional plagiocephaly or brachycephaly.
If your insurance denies coverage, it’s worth appealing. Many families succeed on appeal with a letter from the pediatrician or specialist documenting the severity of the deformity and the medical rationale for treatment. Some helmet providers also offer payment plans to spread out the cost.