It Looks Like Being Too Sensitive. For a Baby Born Early, a Rehearsal Got Cut Short.

Last updated: July 16, 2026

Somewhere around week 20 of a pregnancy, long before a baby has any use for them, a set of automatic movements begins to rehearse. They keep rehearsing through about week 30, and the long squeeze of labor is meant to be their opening night. A baby who arrives early skips part of that rehearsal, through no decision anyone in the room made. Years later a parent stands in a kitchen holding a shirt their child refuses to wear, and nobody connects those two facts out loud.

TL;DR

A group of primitive reflexes develops in utero across roughly the 20 to 30 week window, so a baby born before that arrives with the rehearsal unfinished.
Occupational therapists describe labor as the trigger for those reflexes, which is why they also look at unusually fast labors, assisted deliveries, and C-sections later in childhood.
None of this is a verdict. The therapists call it a perfect storm rather than a single cause, and say plainly that it is not a guarantee of anything.
Brain imaging from Shaywitz at Yale and Temple at Stanford shows struggling children build the same neural pathways as their peers with the right practice, so an early birth sets a starting line and not a ceiling.
The highest-value actions at home are free: floor time instead of container time, and heavy proprioceptive work offered as a swap for unsafe sensory seeking.

FROM THE VIDEO

Key moments from All Things Sensory by Harkla, with occupational therapy assistants Rachel and Jessica:

Rachel lays out the window: a handful of primitive reflexes develop around the 20 to 30 week mark, so a baby born before that has not finished developing them. Watch at 09:27
The swaddle line most parents have never heard: a baby rehearses milestones in their sleep before mastering them awake, and a swaddle is technically a container. Watch at 15:03
Jessica’s swap for a child who crashes and breaks his toys: full-body heavy work, weighted balls, crawling through tunnels, and other proprioceptive input. Watch at 20:07

Common questions from parents

Does being born prematurely mean my child will have sensory processing problems?

No. The occupational therapists in this episode are explicit that an early birth is not a guarantee of anything. They describe it as one factor among several, closer to a perfect storm than a single cause. Plenty of children born early have no sensory difficulty at all. It is a reason to look, not a verdict.

My child was born early and struggles with sensory issues. Is it my fault?

It is not, and the hosts say so before they say anything else, because they know parents arrive at this topic already braced for blame. Nobody chooses a due date. The useful question is not what happened at week 29. It is what the nervous system gets to practise this month, because that part is still moving.

Is it too late to help if my child is already at school?

No. Brain-imaging research from Shaywitz at Yale and Temple at Stanford found that children who struggle build the same neural pathways as their peers after the right kind of intervention. The brain rewires with practice. An early start shapes the beginning of the story and does not write the end of it.

Should I get my child assessed for retained primitive reflexes?

Reflex screening tools and checklists are a starting point, not a diagnosis. They point you toward where to begin at home today. If your child might need formal accommodations such as an IEP or 504 plan, or you suspect a vision, hearing, or medical cause, pursue a professional evaluation as well, because that is the only route to those supports.

What is the single most useful thing to do tonight?

Trade container time for floor time. For a baby, that means time free on the floor to roll, push up, and twist. For an older child, it means ten minutes of heavy work before the demand you know is coming: crawling, pushing something weighted, jumping and landing. Short and daily beats long and occasional.

A swaddle is a container. Occupational therapists point out that babies rehearse milestones in their sleep before mastering them awake, so the suit that buys you rest quietly removes the practice. Tweet Now Follow Learning Success

The reflexes your child was born with had a schedule

On the podcast All Things Sensory, occupational therapy assistants Rachel and Jessica walk through what they look at when a child struggles with sensory life. Rachel is direct about the timeline. A handful of primitive reflexes develop in that 20 to 30 week window, she says. A baby born before that has not finished developing them. That shapes how those reflexes integrate later on. Jessica’s answer is two words: “That’s a big one.”

Their picture of birth is worth sitting with. They describe labor itself as the trigger, not only the exit. Each contraction stimulates a reflex. The moro reflex fires with that first breath. A baby who moves through the birth canal quickly gets less of that mechanical wake-up. So does a baby lifted out through a C-section, which is often the right and life-saving call. Add an early arrival and the rehearsal is shorter still.

Here is the part that gets lost. Your child is not broken. Their nervous system is learning to read the world in a different order, and it started that work on a timeline nobody handed you. The tag in the shirt is not drama. It is a body reporting the volume honestly.

Author Quote "

What happened at 29 weeks sits in the past and will not move. The wiring built on top of it sits in the present and moves with what happens next.

Laura Lurns Learning Success Expert

"Children with reading difficulties develop the same neural pathways as typical readers after intensive, appropriate intervention. The brain physically rewires with practice." - Shaywitz (Yale) and Temple (Stanford), brain-imaging research on intervention

Nothing about a hard start makes a brain fixed

Most parents of children born early are carrying a quiet second sentence underneath the first one. It sounds like this: if it happened at birth, the damage is done and I caused it. Rachel and Jessica head that off inside the first two minutes. They are not placing blame on anyone, they say. None of it is a guarantee. It is closer to a perfect storm, several things stacking, and sometimes only one.

The science goes further than reassurance. Brain-imaging work came out of Shaywitz’s group at Yale and Temple’s line of research at Stanford. It found something plain. Children who struggle build the same neural pathways as their peers after the right kind of intervention. The brain physically rewires with practice. The International Dyslexia Association moved its own 2025 definition away from the old fixed model for the same reason. A cause and a ceiling are two different things, and the world keeps handing parents the first one dressed up as the second.

So hold both. What happened at 29 weeks sits in the past and will not move. The wiring built on top of it sits in the present and moves with what happens next. No milestone, missed or met, locks a developing brain shut.

Key Takeaways:

Reflexes ran on a prenatal clock: A handful develop between 20 and 30 weeks, before an early arrival interrupts them.

A cause is not a ceiling: Shaywitz and Temple imaging shows struggling brains rewire with the right practice.

Seeking is a request: Crashing and chewing ask for proprioceptive input, so swap it rather than punish it.

What actually helps, starting tonight

The practical work here is unglamorous and it is free. Rachel and Jessica keep returning to floor time and to what they call containers: car seats, bouncers, and the swaddle. A baby rehearses milestones in their sleep before mastering them awake, Rachel says, so a swaddle worn past the rolling stage quietly removes the practice. The instruction is small and immediate. Put the baby on the floor. Let the movement be boring and constant.

For an older child, the move is a swap rather than a stop. Jessica’s answer to a five-year-old who smashes his toy cars until they break is not a punishment. It is more proprioceptive input: full-body heavy work, crawling through tunnels, pushing weighted balls, jumping and crashing into something built for it. The crashing was never the problem. It was a request, sent in the only language a nervous system has. The fidget is not a reward either, and neither is the swing.

Notice what this asks of you, and what it does not. It does not ask you to relitigate a delivery room. It asks for ten minutes of floor, a heavier bin of work before homework, and the willingness to read a behaviour as a signal:

Trade container time for floor time. Every minute an infant spends free on their stomach is a minute of rehearsal they were short-changed on.
Feed the seeking, do not fight it. Crashing, chewing, and squeezing are input requests. Give a safer version of the same input before the meltdown, not after.
Look at the body before the behaviour. The hosts read a five-year-old’s night-time accidents as a question about interoception, the sense of the body’s own signals, rather than a question about willfulness.
Go small and daily. Rachel’s own framing is that this is a marathon and not a sprint. Short repeated practice beats an intense weekend.

Author Quote "

The crashing was never the problem. It was a request, sent in the only language a nervous system has.

You wanted a straightforward beginning for your child and you did not get one. Someone else decided the date. What you got instead was a kitchen full of small negotiations about shirts and socks and noise, and a school system that watched the sensory piece surface at a desk seven years later and called it behaviour. That is the villain here, and it was never you: a world fluent in labelling a child and illiterate in helping one. The people who spend the most hours watching your child struggle and succeed are not the ones writing the textbooks. They are the ones reading this sentence right now.

If you want the daily practice that builds the sensory and motor foundations underneath all of this, Brain Bloom is where we teach it, in short sessions built for a real evening rather than a clinic hour.

A sensory struggle rarely travels alone. Most children who fight the tag in the shirt also show signs of shaky focus, an overloaded working memory, and a confidence that has taken more hits than anyone counted. Those systems were built together and they respond best when they are worked on together, which is exactly what All Access was built to do. Start with the ten minutes on the floor tonight. Nobody will ever advocate for your child as hard as you will.