Should I Worry About My Baby's Head Shape?



My Baby's Head Shape: Should I Be Worried?

Quick answer: Baby head shape is particularly variable and soft during the first 4–6 months. Minor asymmetry is mostly normal; however, shape deformity that becomes more noticeable and persists after the 2nd month should be assessed. See your paediatrician or orthotist.

• Positional flattening: Usually resolves with repositioning + tummy time.
• Moderate to severe head asymmetry: Helmet therapy can be assessed at 4–6 months.
• Craniosynostosis suspicion: Hardness along a suture, slowed growth → urgent assessment.

Bringing a baby home from hospital can be a daunting time for new parents. The list of things to worry about can seem endless as a baby develops — and head shape may be on that list. A head shape concern usually stems from a benign condition called Positional Plagiocephaly. Your doctor will help ensure it is not caused by a more serious condition called Craniosynostosis.

What Should a Normal Baby Head Shape Look Like?

In newborns, head shape can often appear slightly asymmetric or elongated — passage through the birth canal, along with the first weeks of sleeping habits, affects this, and most of it softens within weeks. A normal baby head shape is generally close to round, with balanced ear and eye alignment and no noticeable one-sided flattening. Mild flattening or asymmetry is common; what matters is the trend toward improvement over time and monitoring of the baby's overall growth and development.

For the types of head shapes and what they look like, see: Baby Head Shapes Guide.

When Does Baby Head Shape Stabilise?

Babies' skull bones are soft at birth; the maturation of bones and sutures typically takes 9–18 months. The question "when does my baby's head shape settle?" does not have a single fixed answer: in most babies, the shape begins to improve as mobility and variety of positioning increase in the early months; noticeable changes are particularly visible between 4–7 months.

Until what age does baby head reshaping occur? Practically speaking, the first year is critical. Assessments can still be done after 12 months, but the range of intervention options is broader when flattening or asymmetry is caught early. If the shape is not improving, asymmetry is worsening, or there are additional findings relating to the fontanelle or skull bones, medical assessment is needed.

How Should Babies Be Positioned for Head Shape?

Babies should be placed on their back for safe sleep — this is important for reducing the risk of Sudden Infant Death Syndrome (SIDS). At the same time, constant pressure on the same side can lead to positional flattening. A balanced approach:

• Place on the back to sleep; do not place a pillow, support, or positioning wedge under the head.
• Increase tummy time (prone play) while awake and supervised.
• Vary the baby's looking direction using toys placed on the less-preferred side.
• Limit time spent in bouncers, car seats, and carriers.

For step-by-step methods: repositioning guide.

When to Worry and See a Doctor

Mild flattening is common and usually regresses with movement and positional variety. Seek a paediatrician or relevant specialist without delay in these situations:

• The head remains noticeably flat or asymmetric on one side, and asymmetry is worsening.
• Difference is visible in forehead, eye, or ear alignment.
• Neck rotation is restricted / torticollis is suspected.
• There is concern about the fontanelle, or a sudden change in head circumference growth.

The distinction between positional flattening (plagiocephaly / brachycephaly) and premature suture fusion (craniosynostosis) is made by medical examination. Below we summarise these two conditions.

What Is Positional Plagiocephaly?

At birth, babies' skulls are soft — this helps them pass through the birth canal. Complete skull formation in a baby can take 9–18 months. During this period some babies develop positional plagiocephaly. This is a flat area on the back or side of the head. Positional plagiocephaly does not affect brain growth or development — it is purely a shape issue.

Causes of Positional Plagiocephaly

The flat area on the back or side of the head is usually caused by repeated pressure on the same region. Other causes include:

• Position of the baby's head in the womb applying pressure on the skull
• Multiple babies in the same pregnancy (twins, triplets)
• Spending too much time lying on the back
• Torticollis (a tight muscle on one side of the neck) can cause the head to tilt or make it harder to turn the head

Important note: Babies should be placed on their backs for safe sleep — this is vital for reducing SIDS risk. Tummy time is done only while awake and under parental supervision.

How Is Positional Plagiocephaly Treated?

In many babies, the flattening self-corrects as the child becomes more active and spends less time lying on the affected area. Other techniques include:

• While on their back, gently turn the baby's head to the non-preferred side. This is the "non-preferred side." Changing sides relieves pressure from the flat spot. Do NOT use any support material to hold the head in place — it can block the airway.
• Place a toy or wrist rattle in your baby's hand and encourage them to look toward the non-preferred side. You can also place toys on that side to encourage looking in that direction.
• While awake, limit time your baby spends in bouncers or baby carriers. If they can sit, this will relieve pressure from the back of the head and build neck strength.
• For babies who cannot yet sit independently, increase supervised tummy time while the baby is awake.
• When carrying your baby, ensure there is no pressure on the flattened side of the head.

In some cases, these methods are not sufficient to round the head. In these situations, your doctor may recommend a custom-made helmet or band. These devices guide skull growth to help it reshape — and are generally very effective. HKM Pro helmet therapy is applied exclusively at CranioWell Orthopedic & Prosthetic Centers.

What Is Craniosynostosis?

Craniosynostosis is a rare condition (1 in every 1,500–2,000 births) in which one or more skull sutures fuse too early. Unlike positional plagiocephaly, craniosynostosis can restrict brain growth and requires surgical intervention. The diagnosis is made by a doctor. Early surgical treatment generally yields excellent outcomes. Learn more: craniosynostosis.