Flat Head Syndrome (Plagiocephaly) in Babies: A Parent’s Guide to Treatment in Sydney
Is your baby developing a flat spot on their head? Discover the causes, treatment options, and how mobile paediatric physiotherapy in Sydney can help with plagiocephaly through positioning and movement strategies.
What Is Plagiocephaly?
Positional plagiocephaly — commonly known as “flat head syndrome” — is one of the most frequently encountered conditions in paediatric physiotherapy. It refers to asymmetric flattening of a baby’s skull, typically on one side of the back of the head, and is caused by external pressure on the soft, pliable skull of a young infant.
The good news? It’s common, it’s treatable, and with the right support early on, most cases resolve well — without surgery or invasive intervention.
As mobile paediatric physiotherapists visiting families across Sydney, we see and treat plagiocephaly regularly, often alongside its common companion: torticollis (neck muscle tightness).
Types of Head Shape Deformity
Understanding the type of flattening helps guide treatment:
Positional Plagiocephaly
Asymmetric flattening on one side of the back of the head. This often causes the ear on the flattened side to appear pushed forward, and over time can create slight facial asymmetry. This is the most common type.
Brachycephaly
Symmetrical occipital flattening — the back of the head is flat across the middle, making the head appear wide and short. Frequently co-exists with plagiocephaly.
Scaphocephaly
An elongated, narrow skull with flattening on both sides. Less common, and often seen in premature babies who spent extended time in the NICU.
What Causes Plagiocephaly?
The skull of a newborn is intentionally soft and flexible — this is necessary for birth and for the rapid brain growth that occurs in the first year. This flexibility also makes it susceptible to external forces.
Positional plagiocephaly is caused by an infant consistently resting in the same position, creating sustained pressure on one area of the skull. Contributing factors include:
- Spending extended time on their back (especially with “back to sleep” safe sleeping guidelines — which remain essential for SIDS prevention)
- Congenital muscular torticollis — a tight SCM muscle causing a head-turning preference
- Prematurity — premature babies have softer skulls and may spend significant time in one position in the NICU
- Low muscle tone or delayed motor development — affecting the baby’s ability to move their head freely
- Multiple pregnancy — limited space in the womb
Importantly, positional plagiocephaly does not cause developmental delay or brain damage. The skull shape is cosmetic, not structural. However, associated conditions like torticollis can affect development if left untreated.
How Is Plagiocephaly Different from Craniosynostosis?
This is an important question, and one we assess carefully. Craniosynostosis is a condition where the skull sutures fuse prematurely, restricting brain growth. It can look similar to positional plagiocephaly but requires a very different management pathway.
Key differences:
| Feature | Positional Plagiocephaly | Craniosynostosis |
|---|---|---|
| Onset | Gradual, after birth | Present at or shortly after birth |
| Cause | External pressure | Premature suture fusion |
| Sutures | Open, soft | Ridged, palpable |
| Progress | Improves with repositioning | Does not improve over time |
| Treatment | Physio, positioning, sometimes helmet | Usually surgical |
If we have any concern about craniosynostosis during our assessment, we will make an urgent referral to a paediatric craniofacial team.
Natural History: Will It Resolve on Its Own?
Most mild to moderate cases of positional plagiocephaly improve naturally as babies develop better head control, begin rolling, and eventually sit upright — taking pressure off the back of the skull. The rapid skull growth in the first 4–6 months of life offers an excellent window for remodelling.
However, without active repositioning strategies and physiotherapy (especially if torticollis is present), improvement may be limited. The more severe the flattening, and the older the baby, the more intervention is needed.
How Physiotherapy Treats Plagiocephaly
Our treatment approach is always individualised and family-centred. We recognise that parents are doing the best they can with safe sleeping guidelines, and we work with those guidelines, not against them.
Repositioning Strategies (Counterpositioning)
We coach parents on how to encourage their baby to turn their head away from the flat side throughout the day — during feeds, nappy changes, cuddles, and play. Simple changes like repositioning the cot or changing the direction of your baby’s feet can make a significant difference.
Tummy Time Programs
Regular, supervised tummy time is one of the most powerful tools for managing plagiocephaly. It relieves pressure on the flat area, strengthens neck and upper body muscles, and supports overall motor development. We help parents establish a tummy time routine that works for their baby — including strategies for babies who resist it.
Torticollis Treatment
If torticollis is present — as it frequently is — treating the neck tightness is essential for plagiocephaly to improve. We provide gentle stretching, strengthening, and handling advice to address the underlying cause.
Environmental Modifications
We’ll walk through your home and suggest practical changes to daily routines and environments to increase your baby’s head-turning in the desired direction — naturally and without force.
Helmet Therapy
For severe plagiocephaly that has not responded adequately to conservative management, helmet therapy (cranial remodelling orthosis) may be recommended. Key points include:
- Optimal timing is 6–7 months of age — early enough that skull growth is still rapid
- After 10 months, helmet therapy is less effective as skull growth slows
- Helmets are custom-fitted by an orthotist and worn 23 hours per day for 6 weeks to 3 months
- We do not recommend sleep pillows or wedges for head shaping, as these pose SIDS risks
When to Seek Physiotherapy
We recommend an early assessment if:
- You notice a flat spot developing on your baby’s head
- Your baby consistently turns their head to one side
- The flat spot is not improving despite tummy time and repositioning efforts
- Your baby is approaching 6 months without significant improvement
- Your GP, MCH nurse, or paediatrician has recommended physiotherapy
Mobile Plagiocephaly Physiotherapy in Sydney
We bring expert, compassionate care to your home across Sydney. Assessing your baby in their own environment means we can see exactly how they’re sleeping, playing, and being held — giving us a complete picture and the most relevant advice.
Frequently Asked Questions
My baby is 3 months old and has a flat head — is it too late for physiotherapy? Not at all. Three months is a great time to begin — you’re well within the optimal treatment window. The earlier we start, the better the outcome.
Do we need to stop safe sleep practices to treat plagiocephaly? No. Safe sleep (back sleeping) remains the most important way to prevent SIDS and we never advise against it. We work within these guidelines using awake tummy time and repositioning during wakeful periods.
How do I know if my baby needs a helmet? Most babies do not need a helmet. Helmet therapy is reserved for severe deformity, cases not responding to conservative measures, or when the window for natural remodelling is closing. We’ll give you an honest assessment and clear recommendation.
Can plagiocephaly affect my child’s development or intelligence? Positional plagiocephaly does not affect brain development or intelligence. It is a cosmetic condition. However, associated torticollis — if untreated — can affect motor development, which is why early physiotherapy matters.
Book a Home Visit in Sydney
Our mobile paediatric physiotherapists are experienced in the assessment and treatment of plagiocephaly across Sydney. We’ll assess your baby, explain exactly what’s happening, and give you practical, evidence-based strategies to help.
📞 Call us or book online for a home visit anywhere in Sydney.
Expert baby physio. No clinic required.