How Is Suitability for Helmet Therapy Determined? Criteria and Age Range

You are concerned about flattening or asymmetry in your baby’s head shape and looking for solutions. Online you have likely encountered “helmet therapy” (cranial orthosis). One question remains: “Is my baby a suitable candidate for this treatment?”

Helmet therapy is not a standard procedure for every head-shape concern. As with a medication or surgical intervention, it has specific indications (conditions for use) and timing. At CranioWell Orthotics & Prosthetics Centers, we recommend this treatment only when medical criteria are met. Here are those criteria:

1. Criterion: Age Range (Timing Matters)

Outcomes with helmet therapy relate closely to the infant’s age and the rate of skull growth.

• 0 – 3 months (early period): The skull is very soft and growth is rapid. Helmet therapy is usually not the first option. Priority is given to repositioning and physiotherapy with active follow-up. Many mild cases improve in this period.
• 4 – 7 months (preferred window): This is often the preferred period to begin helmet therapy. Head growth remains rapid, and the baby can usually control the head. Treatments started in these months often progress more quickly and may be shorter.
• 8 – 18 months (mid to late period): Treatment can still be appropriate and helpful. Because the bones are hardening and growth is slowing, the course may last longer.
• 18 months and older: This is generally considered the upper limit for helmet therapy. The fontanelle is closing and the bones are firmer. After 18 months the reshaping effect is usually limited, so it is rarely recommended except in uncommon exceptions.

2. Criterion: Severity of Asymmetry (CVAI Value)

As detailed in our previous article, the Cranial Vault Asymmetry Index (CVAI) provides an objective basis for decision-making. A visual impression of “a little uneven” is not enough.

• Mild asymmetry (3.5% – 6.25%): A helmet is usually not recommended. Monitoring and exercises are often sufficient.
• Moderate asymmetry (6.25% – 8.75%): This is a “gray zone.” If the baby is older than 5 months and there is no improvement despite repositioning, a helmet may be considered.
• Advanced asymmetry (> 9%): This level is generally accepted as a clear indication for helmet therapy. Full spontaneous correction at this severity is not expected.

3. Criterion: Source of the Problem (Diagnosis)

Helmet therapy (cranial orthosis) is used on its own only for positional (deformational) head-shape concerns:

• Deformational plagiocephaly (asymmetrical / flat head)
• Deformational brachycephaly (flat back of the head)
• Positional scaphocephaly (long, narrow head)

When it is not used alone (contraindications):

• Craniosynostosis (premature suture fusion): A helmet is not fitted without surgery first when indicated.
• Hydrocephalus: In infants with uncontrolled increase in cerebrospinal fluid, abnormal head volume growth can make helmet therapy risky. Physician approval is required.

How Does the Evaluation Process Work?

At CranioWell, suitability is decided in three steps:

1. 3D scanning and measurement: The baby’s head is scanned; a millimeter-level report and CVAI value are produced.
2. Clinical examination: Neck muscles (is torticollis present?), ear alignment, and facial asymmetry are assessed by our specialists.
3. Family discussion: Report findings, the baby’s age, and family expectations are reviewed together.
   • Example: If your baby is 4 months old with mild asymmetry (CVAI 4%), we may say: “Do not start a helmet yet; practice exercises for 1 month and remeasure.”
   • Example: If your baby is 7 months old with advanced asymmetry (CVAI 10%), we may say: “We should begin without delay.”

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Frequently asked questions

My baby is 12 months old—are we too late?

No. Meaningful improvement is still often seen between 12 and 14 months. The course may simply last longer than for a 4-month-old (for example, 5–6 months instead of 3). What matters is that the fontanelle and sutures are still open.

It is only a shape concern, with no health issue. Should we still consider a helmet?

Advanced deformational plagiocephaly is not only an aesthetic issue. Later challenges with the jaw joint (TMJ), glasses or helmet fit, and facial asymmetry may occur. Social and psychological effects should also be considered. The decision always belongs to the family.

Should we see a doctor before helmet therapy?

Yes. Before starting helmet therapy at CranioWell Orthotics & Prosthetics Centers, we strongly recommend that your baby be evaluated by a pediatrician or relevant specialist to confirm there is no underlying pathology such as synostosis.

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Conclusion: The Right Decision for the Right Baby

Helmet therapy is not a “miracle”; it is a medically grounded process. The most important step for a good outcome is appropriate patient selection.

If you are unsure whether your baby meets the criteria, do not rely only on online comments. Visit a CranioWell Orthotics & Prosthetics Center for a free 3D scan. Using the data, we can set an honest, transparent plan for your baby together.

This content is for information only and does not replace medical diagnosis or treatment.