You run your hand over your baby's head and one side feels flatter than the other. Maybe your baby always turns the same way, and you are wondering whether you missed something. I am Nicolas Grimaldi, a pediatric osteopath, and a baby flat head is one of the most common worries parents bring to me. Here is what causes it, and what I tell parents in my practice.
What causes a baby flat head?
In my practice, most flat heads trace back to what happened during birth. Forceps and vacuum deliveries have the biggest impact. A long labor, a very fast one, a delivery that is held back, or pressure applied on the mother's stomach can all affect the shape of a baby's skull. A planned C-section works differently. The skull never goes through the expansion of a vaginal birth. For certain skull shapes the occiput, the bone at the back of the head, stays folded. Instead of covering the parietal bones on either side, it sits underneath them, and it tends to flatten.
Is a baby flat head caused by your baby's position?
My answer is no, and this is where I differ from the standard view. The medical term positional plagiocephaly puts the cause on the position itself. In my practice the flattening comes from internal tensions, in the skull or referred up from the spine, and those tensions are what pull a baby toward one preferred side. I see this as a vicious cycle. Your baby has an imbalance. That imbalance pulls your baby into a preferred position. The preferred position and the tension together favor the deformation. In my reading, the position is a consequence of the tension, and not the starting point. This is also why I am careful with the word torticollis. A true torticollis is a real shortening of the SCM, the muscle running down the side of the neck. Many babies who always look the same way do not have that. They have tension, usually coming from the upper back or the lumbar spine, that makes them look as though they do.
When should you start working on a flat head?
Immediately. Prevention is the best intervention, so I ask parents to bring their baby to an osteopath in the first days after birth, and not after a week or a month. I regularly see babies who arrive months later, when the same work takes far longer. The reason is growth. A newborn's skull is around 25 percent of adult size. In the first three to four months it gains more than 20 percent. By around one year it sits at roughly 75 percent. That early stretch is the largest amount of skull growth your baby will ever go through, and it is the easiest time to influence shape. Ossification does not mean the skull locks shut. I want to be precise about this. Ossification is bone cells colonizing the membrane and cartilage that make up a newborn's skull. It is a colonization, not a closing. The sutures never close. They stay mobile for the rest of your baby's life.
How long does it take to reshape a baby's head?
Longer than most parents expect. Here are the rough timelines I see in my practice. A baby I see at two or three days old usually needs around three months of work. A baby I see at three or four months needs eight to twelve months. After four to six months, it takes considerably longer. These are averages. It depends on the severity. Some babies go faster than expected, some go slower. What stays constant is that this is long-term work. Parents often arrive hoping for a fast change, and reshaping a skull does not work that way.
What can you do at home for a baby flat head?
The goal is simple. Take pressure off the flattened side and give the skull space to reshape. I build that into the whole day, sleep included, and pair it with holds and gentle hands-on work that release the tensions underneath. The routine has four parts, and it only does its job when you run all of them. I teach each part on video in the Fulkrum Academy 0 to 6 months program, because the detail is what decides whether they help.
- Pressure relief around the clock. The starting point is keeping pressure off the flattened side, so the skull has room to reshape. Which positions do that depends on where the flat spot sits, and I set the whole protocol out in the Academy.
- The tiger hold. This is my default way to carry and settle a young baby, from the moment your baby is awake. The hold only works when your hands are placed correctly, so I demonstrate it in the Academy.
- Massage and stretch work, if your baby already shows a preferred side. It targets the tension underneath that preferred side. The sequence has to be learned properly, and I teach it step by step in the Academy.
- A deeper technique from my clinical program that activates the back muscles. I do not put this one in writing, because it has to be seen. You learn it inside the Academy.
How should your baby sleep with a flat head?
The positioning work does not stop when your baby falls asleep. It runs around the clock, and I count sleep as part of the protocol. The setup depends on which side the flattening is on, so no single position fits every baby. Which side to use, and how to set it up, I go through in the Academy program. Which technique suits which age is set out in the Fulkrum Academy 0 to 6 months program, where I demonstrate each one. Let me be direct about what makes this work. It is not one hold done now and then. It is a routine you run all day long, repeatedly. Parents who put the whole routine in place have reported changes back to me. I am not saying this is the formula. What I claim is that these techniques build a ground of balance and strength that supports your baby's development. That is also why I would rather teach you the whole routine than hand you one piece of it.
When should you see a professional?
Early, and for two reasons. In the first days I can pick up strains on the skull before they settle, and that is the whole point of coming in early. And a small number of head shapes are not the common kind of flattening at all, so anything that worries you deserves professional eyes on it. If you are looking for someone, start from my list of vetted pediatric osteopaths. Every name on it came through me. The exception I separate out is craniosynostosis. Here a suture, or part of one, is fused. I call it a medical emergency. It often requires surgery, because of the risk from internal pressure inside the skull. This is not what most flat heads are. It is also not something you can assess at home, which is another reason to have a professional look early.
Common questions about a baby flat head
Will a flat head even out on its own?
I would not count on waiting. In my view the flattening is held in place by tensions that keep pulling your baby toward the same side. Until that imbalance is worked on, the same pressure keeps landing on the same spot. My answer is to start early, and not to watch and wait.
Is it too late if my baby is already four or five months old?
No, though expect it to take considerably longer. My timelines stretch out once a baby is past four months. The skull keeps growing well beyond the first year, and the sutures stay mobile for life, so there is still room to work. The early window is simply the fastest one.
Do I still need an osteopath if I do the routine at home?
My first advice stays the same: see an osteopath in the first days. Parents who ran the full routine without osteopathy have reported changes back to me, and I am not saying this is the formula. What I claim for the techniques is that they build balance and strength.
Learn the whole routine with me
This article gives you the reasoning. The hands-on part is taught in full in the Fulkrum Academy 0 to 6 months program, where I demonstrate every technique on video, step by step, in the order I use them. The tiger hold, the massage and stretch sequences, the deeper technique I keep for the program, and the sleep setup this article stops short of. If your baby has a flat spot, or a side they always turn toward, the next step is learning what to do with your hands. Sign up to the Fulkrum Academy 0 to 6 months program and work through it with me. You get the full daily routine and every technique that goes into it. That is the part an article cannot give you.