The flat spot started small, maybe you noticed it during a diaper change or your pediatrician pointed it out at a checkup. Then it seemed to get more noticeable, and you also started seeing that your baby strongly prefers turning their head one direction, or resists the other side entirely. A helmet got mentioned as the next step. Before committing to that, it is worth understanding what is actually behind the flattening, because head shape and neck movement are often the same story.
What Plagiocephaly Is
Plagiocephaly is a flattened area on a baby's head, usually on one side or across the back, that develops because an infant's skull is still soft and pliable enough to change shape under repeated pressure. It is sometimes called flat head syndrome. It is different from craniosynostosis, a separate and much less common condition where the skull bones fuse together too early. In plagiocephaly, the bones themselves are fine. The shape has simply changed under consistent pressure from one position.
What Causes It
Plagiocephaly develops most often when a baby spends a lot of time in the same head position, whether that is from back sleeping, time in a car seat or swing, or a head turning preference that keeps pressure concentrated on the same spot. A meaningful share of babies who sleep on their backs, which remains the safest sleep position, develop some degree of flattening as a result.
The tendency toward one position can start even before birth. A baby positioned with their head pressed against the wall of the uterus for an extended stretch, more common with twins or in a tight fit late in pregnancy, can arrive with an early head turning preference already in place. Premature babies, who often spend extended time lying in one position in the NICU while recovering, face a similar risk.
Muscular torticollis, a tightness in the neck muscle that pulls a baby's head to one side and makes it hard to turn the other way, frequently travels alongside plagiocephaly. The two conditions reinforce each other. Limited neck rotation keeps pressure concentrated on one side of the head, and that ongoing pressure keeps reinforcing the position the neck is already stuck in.
The Role of Birth
Birth itself plays a real part in this picture. Research has linked delivery involving forceps or vacuum assistance to a higher likelihood of plagiocephaly, and longer vacuum application in particular has been associated with more pronounced flattening. A difficult or fast C-section can create similar tension. The physical forces involved in these deliveries can leave tightness in a baby's upper neck that limits how freely they can turn their head, which is the piece that a helmet alone does not touch.
Why a Helmet Is Only Part of the Picture
A helmet works by redirecting growth away from the flattened area as the skull continues to develop, and it can be a genuinely useful tool for more significant cases. What it does not do is address why the baby was holding their head in one position in the first place. If neck tension or a turning preference caused the pressure pattern to begin with, that same tension typically remains after the helmet comes off, which is why some families see the flat spot improve with a helmet while the underlying neck restriction stays unresolved, sometimes showing up later as ongoing stiffness or a lingering preference for one side.
Symptoms to Watch For
- A visible flat area on one side or the back of the head
- Less hair growth on the flattened side
- One ear appearing pushed slightly forward compared to the other
- Noticeable asymmetry between the eyes, ears, or other facial features
- A clear preference for turning the head one direction over the other
- In more pronounced cases, slight forehead bulging on the side opposite the flattening
Plagiocephaly itself is not typically painful, but the underlying restricted movement it often travels with can affect motor development if it goes unaddressed, and some research points to those effects continuing into the toddler years. Kids with an unresolved neck restriction can also be more prone to ear infections, since limited motion through the neck and upper spine can make it harder for fluid to drain properly from the ears.
Our Approach
Our doctors start with a full history, including your pregnancy and delivery, and a gentle exam of your baby's neck movement and head shape. INSiGHT neurological scanning, thermal, heart rate variability, and sEMG, takes just minutes and helps us see where nervous system stress and tension are concentrated, often showing up as an imbalance between the two sides of the neck. Using Koren Specific Technique and Talsky Tonal Chiropractic, our doctors use very light, nervous system focused adjustments, no cracking or twisting, aimed at easing that tension so your baby can turn their head freely in both directions and their skull can round out naturally as they grow.
A few things help at home alongside care:
- Plenty of supervised tummy time and frequent position changes throughout the day
- Limiting long stretches in car seats, swings, and bouncers where the head stays still
- Alternating the side you hold your baby for feeding and carrying
What Parents Often Notice
Families often notice their baby turning more freely to both sides within the first several visits, along with less resistance during tummy time. Sleep sometimes improves as neck tension eases, since a baby who was working around discomfort in certain positions can settle more easily once that tension lifts. Head shape changes take longer and depend on how much growing your baby still has ahead, so our doctors keep an eye on both the neck movement and the shape together rather than judging progress by the head alone.
Where to Go From Here
If your baby's flat spot has come with a clear head turning preference or resistance to tummy time, our doctors in Royal Oak would welcome the chance to take a look. Read more about how we support plagiocephaly and related torticollis, or get our free guide. When you are ready, book online, or call us at (248) 616-0900.
