Head Shape
Head Development in Babies with Early Fontanelle Closure
Early fontanelle closure can be a sign of craniosynostosis. Learn what to look for, when to seek medical advice, and what treatment options are available.
Short answer: Closure of the anterior fontanelle before 6 months is a finding that should be assessed for craniosynostosis — however, early closure does not always mean craniosynostosis. Head growth curve, the status of the sutures, and neurological development must all be evaluated together.
- Craniosynostosis risk: If seen alongside premature fusion of the skull sutures, surgery may be evaluated.
- Isolated early closure: If sutures are open, it is usually not a problem; medical monitoring is sufficient.
- Intellectual development: Isolated early fontanelle closure alone does not affect intellectual development.
Head development in babies with early fontanelle closure is not usually a very alarming situation. The fontanelle — medically known as the fontanel — consists of the soft spots on a baby's skull where the bones have not yet fused. These areas are vital for brain growth and the natural development of head shape.
However, in some cases, early fontanelle closure can affect head development.
At CranioWell Orthotics and Prosthetics Centres, we explain the causes, signs, and monitoring process for this condition.
What Is the Fontanelle and When Does It Close?
Babies have two main fontanelles:
- Anterior fontanelle: Located at the top-front of the head, it typically closes between 7–18 months.
- Posterior fontanelle: Located at the back of the head, it typically closes within the first 2 months after birth.
The fontanelle allows the brain to develop and the skull bones to flex during delivery.
If it closes early, this flexibility is reduced, which can create a risk of restricted brain growth or head shape deformity.
Why Does the Fontanelle Close Early?
The following causes are generally observed in babies with early fontanelle closure:
- Craniosynostosis: Premature fusion of the skull sutures (the lines where the bones join)
- Metabolic disorders: Thyroid hormone irregularities or vitamin D deficiency
- Genetic factors: Familial tendency or syndromic conditions
- Mechanical factors: Pressure in the womb or fixed head positions after birth
Signs of Early Closure
- The head appearing smaller than expected (tendency towards microcephaly)
- Asymmetry or deformity in part of the head
- The fontanelle not being felt, or feeling like a hard ridge
- Baby's irritability, head circumference not increasing
- Tendency to look downwards with the eyes, or signs of increased intracranial pressure
If these signs are noticed, a paediatrician or paediatric neurosurgery specialist should be consulted without delay.
How Does Early Fontanelle Closure Affect Brain Development?
Normally, a baby's brain growth in the first year is reflected in the head circumference.
If the fontanelle closes early, the skull bones may not allow enough room for the brain to expand.
In the long term, this can result in:
- Head shape deformities (such as plagiocephaly, brachycephaly),
- Developmental delay or signs of neurological pressure.
Monitoring and Correction with the CranioWell HKM Pro Helmet
Surgery is not always the first option in cases of early fontanelle closure.
If the head shape has become deformed but growth potential continues, correction can be achieved with the CranioWell HKM Pro treatment process:
| Stage | Duration | Description |
|---|---|---|
| 1. 3D Scan | 15 min | Head circumference, asymmetry and suture directions are measured. |
| 2. Design | 3–5 days | A bespoke helmet model is created. |
| 3. Fitting | Week 1 | The helmet is fitted to the baby and the family is trained. |
| 4. Review | Every 2–3 weeks | Progress is monitored and adjustments are made. |
The CranioWell HKM Pro is a UTS-registered medical device. This confirms that the product complies with both Turkish and European regulations.
When Is Intervention Needed in Early Fontanelle Closure?
If the fontanelle:
- has closed before 6 months,
- the head circumference growth curve is declining,
- asymmetry is pronounced,
- brain MRI shows signs of pressure,
surgery or helmet therapy may be considered.
Surgery is generally performed for multiple suture closures.
Monitoring Recommendations for Parents
- Note down your baby's head circumference measurement at every paediatric check-up.
- Check your baby's fontanelle gently with your fingertips every month.
- If the fontanelle has hardened or is bulging, consult your doctor.
- Change your baby's sleeping position frequently.
- Do tummy time exercises regularly.
Frequently asked questions
Are babies with early fontanelle closure more intelligent?
This belief is widespread but has not been medically confirmed. There is no direct causal relationship between early fontanelle closure and intelligence. On the contrary, if craniosynostosis is present and left untreated, increased intracranial pressure can adversely affect cognitive development. Early closure may therefore indicate a condition requiring prompt intervention — it is not an indicator of superior intelligence.
What are the signs of early fontanelle closure?
The most important signs of early closure are: the head appearing smaller than normal (microcephaly), a hard ridge or bump felt over the skull sutures, pronounced asymmetry or a pointed shape in the forehead or head, and the baby's growth curve slowing. These findings alone do not make a definitive diagnosis; a paediatric or craniofacial surgical evaluation is required.
Does early fontanelle closure require surgery?
Once a diagnosis of craniosynostosis is confirmed, surgical intervention is often recommended; the ideal window is usually within the first 6–12 months. The type of surgery (endoscopic or open) is determined by which suture is affected and the type of craniosynostosis. Isolated early fontanelle closure (when the sutures are healthily open) usually does not require surgery.
Why does the fontanelle close early?
Causes include: craniosynostosis (genetic mutations or syndromic causes), excess thyroid hormone (hyperthyroidism), excess vitamin D, and microcephaly. However, in many cases no clear cause can be identified and early closure is considered within the range of normal variation.
Does brain development stop if the fontanelle closes early?
No, but the head volume may be restricted. This is why early detection and medical monitoring is important in such cases.
Can the fontanelle re-open once it has closed?
No. Closed sutures do not re-open. However, because surrounding bones continue to grow, head development can be supported with the right treatment.
What can I do at home?
Avoid keeping your baby lying in one direction only — change position frequently and ensure adequate fluid intake.
Related: what is craniosynostosis, plagiocephaly and flat head syndrome.