Plagiocephaly describes an asymmetrical head shape in a baby, most commonly a flattening on one side of the back of the skull. You might hear it called positional plagiocephaly or deformational plagiocephaly because it usually develops from repeated pressure on the same area of the head (for example, if a baby strongly prefers to rest looking one way).
Many families first notice plagiocephaly when looking down at their baby’s head, in photos, or when someone comments that the head looks “a bit flat” on one side. Often the forehead on the same side may look slightly more prominent, and the ear on that side can look shifted forward. Some babies have more general flattening across the whole back of the head, which is called brachycephaly (short, broad head shape). Some have a combination of both.
Plagiocephaly is common in infancy, and for many babies it improves with early management. Importantly, plagiocephaly is different from craniosynostosis, which is when one or more skull sutures fuse too early. Craniosynostosis needs specialist medical assessment and often surgical input. Positional plagiocephaly is usually managed conservatively with positioning, activity changes, and targeted therapy.
Physiotherapy for plagiocephaly is particularly valuable when the flat spot is linked with a neck preference or reduced neck range of motion. This commonly occurs with congenital muscular torticollis, where one sternocleidomastoid muscle is tight and the baby tilts and turns in a predictable pattern. A physiotherapist can assess the neck and body movement, identify why your baby is always resting the same way, and give you a clear plan to change those habits safely.
Plagiocephaly management is not about placing your baby in unsafe sleep positions. Safe sleep recommendations still apply. Instead, physiotherapy focuses on changing what happens during awake time: how your baby is carried, fed, played with, positioned, and encouraged to turn and move so pressure is spread more evenly and head movement becomes symmetrical.
Early support matters because a baby’s skull is most mouldable in the first months of life. If you are worried about head shape, seeing a physiotherapist early can help you understand what is happening and what you can do at home.
Key Facts
- Positional plagiocephaly is a flattened head shape that commonly develops when a baby consistently rests in one position. 🔗
- A Pediatrics in Review article describes the strong association between positional plagiocephaly and torticollis, and supports early referral to physical therapy when neck range or preference is present. 🔗
- A 2016 study found helmet therapy did not provide meaningful added benefit for positional skull deformation in a general population sample, supporting careful case selection and counselling. 🔗
Risk Factors
- Congenital muscular torticollis or any restriction in neck movement.
- Limited tummy time and reduced floor play in early months.
- High use of car capsules, swings, bouncers, and other containers during awake time.
- Prematurity or low tone, which can reduce spontaneous head repositioning.
- Multiple births or in-utero positioning constraints that contribute to early head preference.
Symptoms
- Flattening on one side of the back of the head (positional plagiocephaly) or across the whole back of the head (brachycephaly).
- A strong preference to rest with the head turned to one side, especially when lying on the back.
- Ear position asymmetry (one ear may look slightly more forward on the flattened side).
- Forehead asymmetry (the forehead on the same side as the flattening may look more prominent).
- Face appearing slightly asymmetrical in more persistent cases (subtle cheek or eye differences).
- Difficulty turning the head both ways, or a head tilt (suggesting congenital muscular torticollis).
- Lower tolerance for tummy time or delayed early motor skills such as rolling (often due to limited variety of positions, rather than true weakness).
Aggravating Factors
- A consistent head-turn preference during sleep and awake rest (always looking the same way).
- Long periods in car capsules, swings, bouncers, or prams where the head rests against a surface for extended time.
- Limited supervised tummy time and floor play, reducing time off the back of the head.
- Congenital muscular torticollis or neck tightness that makes turning one way harder.
- Prematurity or low muscle tone, which can reduce a baby’s ability to reposition their head independently.
Causes
Positional plagiocephaly develops when pressure is repeatedly applied to the same area of a baby’s skull. A baby’s skull bones are designed to be flexible early in life, which supports brain growth. That flexibility also means the skull can mould with repeated positioning.
Common contributors include:
- Head preference:
Many babies naturally prefer to look one way. If that preference is strong and consistent, the head rests on the same spot and a flat area can develop. - Neck tightness (congenital muscular torticollis):
If one sternocleidomastoid muscle is tight, the baby may find it difficult to rotate their head equally both ways. This makes the positional preference harder to break without physiotherapy. - Environment and routines:
Long time in carriers or seats, and limited tummy time, increases the hours a baby spends resting on the back of their head. - Prematurity and medical complexity:
Some babies, particularly those born preterm, spend more time in supported positions early on and may have less ability to reposition their head independently.
A key role of physiotherapy for plagiocephaly is identifying the specific driver for your baby. Two babies can have a similar-looking flat spot for different reasons, and the most effective plan targets the reason, not just the head shape.
How Is It Diagnosed?
Plagiocephaly is usually diagnosed through a physical assessment. Your GP, child health nurse, paediatrician, or physiotherapist will look at your baby’s head shape from multiple angles and check for signs that suggest positional moulding versus craniosynostosis.
A physiotherapist assessment is particularly helpful because it includes:
- Neck range of motion (can your baby turn both ways and side-bend comfortably?).
- Head posture and preference (which way does your baby naturally look in different positions?).
- Motor development and symmetry (reaching, rolling, tummy time tolerance, trunk symmetry).
- Environment review (sleep set-up, feeding positions, play set-ups, and time in containers).
If the head shape is unusual, worsening despite good management, or there are concerns about suture fusion, medical review is important. Craniosynostosis can look different to positional plagiocephaly and may require imaging and specialist input.
Investigations & Imaging
- Clinical head shape assessment
- Identifies positional plagiocephaly patterns and screens for features that suggest craniosynostosis; physiotherapists also assess neck range of motion and positional preference.
- Cranial measurements (for example cranial vault asymmetry or ratio measures)
- Quantifies head shape asymmetry to track change over time and guide decisions about intensity of repositioning, physiotherapy, and referral pathways.
- 3D head scan (selected services)
- Provides more detailed measurement of head shape and can help with monitoring and helmet therapy planning in selected cases.
- Neck assessment for torticollis
- Checks for sternocleidomastoid tightness and passive range restriction that commonly drives positional plagiocephaly, and guides physiotherapy for plagiocephaly.
- Imaging (X-ray, ultrasound, or CT) when craniosynostosis is suspected
- Not routinely needed for positional plagiocephaly. Used when head shape features suggest suture fusion, or when progress is atypical and specialist assessment indicates imaging.
Grading / Classification
- Type: Plagiocephaly
- Asymmetrical flattening, usually on one side of the back of the head, often with ear and forehead asymmetry on the same side.
- Type: Brachycephaly
- More symmetrical flattening across the back of the head, leading to a shorter, wider head shape.
- Severity grading (clinical)
- Clinicians may describe severity as mild, moderate or severe based on head shape appearance and measurement values (for example cranial vault asymmetry). Severity helps guide how urgently repositioning and physiotherapy should be started and whether helmet referral is discussed.
Physiotherapy Management
Physiotherapy for plagiocephaly focuses on changing the reasons your baby is loading one part of their head, while also supporting symmetrical movement and motor development. Physio is especially important when there is a strong head-turn preference or congenital muscular torticollis, because repositioning alone is often not enough if the baby physically struggles to turn the head both ways.
Plagiocephaly physiotherapy usually includes a combination of:
- Repositioning and environmental changes during awake time.
- Neck range of motion strategies when tightness is present.
- Play-based strengthening and active head turning practice.
- Motor development support, including tummy time progression and symmetrical rolling and reaching.
- Parent education so the plan is built into daily routines rather than being an extra burden.
Exercise
Exercise for plagiocephaly is usually play-based and aimed at improving active head turning and symmetrical movement. If neck tightness is present, a physiotherapist may teach gentle stretches to improve rotation and side bending, always using your baby’s comfort cues and correct support.
- Active range of motion is the big driver of change. A physio will show you how to position toys, mirrors and your own face and voice so your baby chooses to turn toward the non-preferred side many times a day. This type of repetition is what changes the habitual pattern that contributes to plagiocephaly.
- Tummy time progression is also a key part of plagiocephaly physiotherapy exercises. Tummy time reduces time on the back of the head and strengthens the neck and trunk. Your physiotherapist can modify tummy time so it is achievable even for babies who dislike it, using short frequent bouts, chest-to-chest positions, towel rolls, or side-lying play as stepping stones.
- Symmetry work may include encouraging reaching with both hands, rolling to both sides, and varying the baby’s trunk position so they are not always curved the same way. This is important because whole-body asymmetry can reinforce head preference.
Activity Modification
Activity modification is the practical heart of plagiocephaly management. The aim is to reduce the hours of pressure on the flat spot while still following safe sleep on the back.
A physiotherapist may recommend:
- Repositioning during awake time:
Using side-lying play, supported upright holding, and more floor time so the head is not always resting on a surface. - Environmental changes:
Swapping the cot orientation, changing where you stand when talking to your baby, and placing toys on the non-preferred side to encourage head turning. - Feeding set-ups:
Alternating feeding arms and adjusting breastfeeding or bottle-feeding positions so the baby practises turning both ways. - Reducing container time:
Limiting prolonged time in car capsules, bouncers, and swings during awake time when practical, and balancing unavoidable car trips with extra floor play and tummy time later.
These changes are most effective when they match your family routine. A physio will help you find realistic options rather than a plan that only works on paper.
Manual Therapy
Manual therapy may be used by a physiotherapist when plagiocephaly is linked with congenital muscular torticollis or neck stiffness. In babies, this is gentle and aimed at improving comfort and helping the baby tolerate turning and positioning strategies. Manual therapy is never the whole treatment. It is used to support the active movement and positioning changes that drive long-term improvement in head preference and symmetry.
Postural Retraining
Postural retraining in plagiocephaly is about building midline head control and symmetrical trunk movement. Some babies develop a consistent “C-shape” through the body, with weight always shifted to one side. This body preference can keep the head turning preference going.
Your physiotherapist may use side-lying play, supported sitting positions, and handling strategies that encourage equal movement to both sides. The goal is to give the baby many opportunities to experience comfortable midline posture, because babies repeat what feels easiest.
Education
Education is one of the most important parts of plagiocephaly physiotherapy because parents and carers are the ones changing the pattern all day.
A physiotherapist will typically educate you on:
- What head shape changes are expected with positional plagiocephaly and how to monitor progress with photos and measurements.
- How to do repositioning safely while keeping safe sleep on the back.
- How to build tummy time and floor play without distress.
- How to recognise signs of congenital muscular torticollis and why neck range matters for plagiocephaly.
- When to seek medical review if head shape is unusual, not improving, or suggests craniosynostosis.
Other
Other physiotherapy inputs may include liaison with your GP or paediatrician if progress is not as expected, or if the head shape pattern is atypical. Physiotherapists also commonly support families through helmet therapy pathways when this is being considered, by ensuring neck movement and head preference are addressed at the same time. Treating the movement driver improves comfort and makes ongoing management more effective.
Other Treatments
Other treatments for plagiocephaly depend on severity, age, and whether conservative management is working.
- Helmet therapy:
In selected cases, a cranial orthosis (helmet) may be discussed, usually when head shape asymmetry is moderate to severe and the baby is within an age window where helmet therapy can still influence skull growth. Helmet therapy should be paired with physiotherapy when a head-turn preference or torticollis is present, because a helmet does not fix the movement driver that created the flat spot. - Medical review:
If craniosynostosis is suspected, referral to a craniofacial team or specialist service is important. This is a different condition with different management. - Occupational therapy:
Some families also work with occupational therapists for positioning strategies and equipment advice, particularly if the baby has low tone or developmental challenges.
Most babies with positional plagiocephaly improve with repositioning, increased tummy time, and physiotherapy when indicated.
Surgery
Surgery is not a treatment for positional plagiocephaly. Surgery is considered when the diagnosis is craniosynostosis or another structural skull condition, which requires specialist medical assessment. If you are concerned about unusual head shape patterns or lack of response to repositioning and physiotherapy, seek medical review to ensure the diagnosis is correct.
Prognosis & Return to Activity
Prognosis for positional plagiocephaly is generally good, especially when management starts early. Many babies show visible improvement over weeks to months when head preference is addressed and floor play increases. Improvement continues as babies begin to roll, sit, and spend less time lying on the back of the head.
For families, the most helpful way to think about plagiocephaly rehab is that it is a pattern change problem. If the baby keeps resting the same way, the flat spot is more likely to persist. If the baby starts moving more symmetrically and has varied positions throughout the day, the skull has opportunity to remodel as it grows.
Physiotherapy supports return to normal infant activity: comfortable tummy time, symmetrical reaching, rolling both ways, and varied play positions. These milestones reduce time on the flat spot and build the movement skills that protect against recurrence.
Complications
- Persistent head shape asymmetry if the positional preference is not changed early.
- Facial asymmetry in more prolonged or severe cases.
- Ongoing neck tightness or congenital muscular torticollis if not treated (can continue to drive asymmetry).
- Asymmetrical motor development habits (for example always rolling the same way), which can persist without targeted practice.
- Delayed tolerance for tummy time and reduced early trunk strength due to limited variety of positions.
Preventing Recurrence
- Start supervised tummy time early and build it gradually each day to reduce time spent on the back of the head and to develop neck and trunk strength.
- Change your baby’s awake-time positions regularly (upright cuddle, side-lying play, floor play) so pressure is not repeatedly on the same part of the skull.
- Limit prolonged container time during awake periods when practical (car capsules, swings, bouncers), and balance unavoidable time with extra floor play later.
- Encourage looking both ways by changing cot orientation and placing toys and interaction on the non-preferred side.
- If you notice a strong head-turn preference or head tilt, see a physiotherapist early to check for congenital muscular torticollis and start plagiocephaly physiotherapy management promptly.
When to See a Physio
- You notice a flat spot developing or worsening, especially if your baby always looks the same way.
- Your baby has difficulty turning their head both ways, has a head tilt, or seems stiff through the neck (possible congenital muscular torticollis).
- Tummy time is very difficult or your baby avoids lifting and turning the head during tummy time.
- You want clear repositioning and plagiocephaly physiotherapy exercises that fit your daily routine.
- Head shape looks unusual, or you are worried about craniosynostosis or lack of improvement despite good management (seek medical review as well).