Understanding early child brain development—and the simple ways parents can support it.
Welcome along to our latest blog post. This week I’d like to discuss child brain development. We’ve all probably seen the odd fact posted on instagram or alike telling us things like “our child’s brain is 80% developed by age 3.” But what else should we know?
As parents, we see our kids grow in real time. One day they’re babbling; the next they’re firing questions at us like “Why do clouds float?” or “How do we get fog?” It’s incredible — and honestly, sometimes overwhelming — how quickly their minds develop.
So I started digging.
And what I found honestly filled me with awe. The science of early brain development is far more powerful, hopeful, and reassuring than most of us realise.
Before we get stuck in I’d just like to say that studying the child’s brain isn’t something I do by day. As some of you may know I’m an engineer, but also a curious parent. So this post is purely that curious parent doing some research and sharing what I’ve found. I’ve included the relevant links for further reading if you ‘d like to do your own digging. It’s a great subject!
Here’s what every parent should know.
How Child Brain Development Actually Works
A child is born with about 100 billion neurons — nearly all the brain cells they’ll ever have. But it’s not about quantity; it’s about connections.
During the first five or six years of life, their brain forms over one million new neural connections per second.
Yes, per second.
This incredible burst of growth is what researchers call a sensitive period, when relationships, routines, and everyday play literally build the architecture of the brain.
Harvard’s Center on the Developing Child explains this beautifully here:
👉 https://developingchild.harvard.edu
10 Science Facts Every Parent Should Know
1. Experience Shapes the Brain’s Wiring
Every new experience — a song, a cuddle, a conversation — strengthens neural pathways.
Repetition cements them. That’s why your child never gets tired of the same book.
🔗 UNICEF: https://www.unicef.org/early-childhood-development
2. The Brain “Prunes” Connections to Work More Efficiently
Around age two, the brain starts pruning unused connections. This is normal — even helpful. It refines skills and strengthens the ones your child uses most.
🔗 Lurie Children’s Hospital:
https://www.luriechildrens.org/en/blog/early-childhood-brain-development-and-health
3. Executive Function Begins in Toddlerhood
Skills like self-control, flexible thinking, and memory start forming much earlier than most people realise.
🔗 Harvard: Executive Function
https://developingchild.harvard.edu/science/key-concepts/executive-function
4. Sensitive Periods Matter
Vision, hearing, movement, and especially language flourish during early sensitive windows.
🔗 NIH Study:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11526699
5. Emotional Regulation Comes From Co-Regulation
Kids aren’t born knowing how to manage big feelings. Their brain learns emotional safety from ours.
🔗 NAEYC:
https://www.naeyc.org/resources/pubs/yc/may2017/caring-relationships-heart-early-brain-development
6. Language Grows Through “Serve & Return”
It’s the back-and-forth that builds language pathways — not just hearing words.
🔗 Harvard: Serve & Return
https://developingchild.harvard.edu/resources/serve-and-return-interaction-shapes-brain-architecture
7. Free Play Literally Builds the Brain
Play isn’t a break from learning. It is learning. Creative play strengthens executive function, social skills, and emotional resilience.
🔗 First Things First: https://www.firstthingsfirst.org/early-childhood-matters/brain-development/
8. Sleep Is Brain Maintenance
While children sleep, their brains file memories, repair cells, and regulate emotions.
🔗 NIH Sleep Research:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3267433
9. Warm, Responsive Relationships Are the Foundation
Secure relationships are the most powerful predictor of healthy child brain development.
🔗 UNICEF ECD:
https://www.unicef.org/early-childhood-development
10. Movement Builds More Than Muscles
Crawling, climbing, balancing — these strengthen sensory systems and problem-solving.
🔗 First Things First: https://www.firstthingsfirst.org/early-childhood-matters/brain-development/
Common Misconceptions About Child Brain Development
Myth: Bigger brains mean smarter kids.
Truth: It’s not the size — it’s the strength of the neural connections.
Myth: Early academics = higher intelligence.
Truth: Play, relationships, and exploration build deeper skills.
Myth: Child Brain development is mostly genetic.
Truth: Experiences shape how genes are expressed.
Myth: “Kids will figure it out on their own.”
Truth: Young brains rely on responsive caregiving to thrive.
Practical Ways to Support Child Brain Development at Home
These aren’t fancy tips — they’re small things that genuinely move the needle.
1. Talk Together Often
Narrate tasks, ask questions, let them ramble.
2. Follow Their Lead in Play
Your presence matters more than perfect activities.
3. Keep Predictable Routines
Routines build emotional security and executive function.
4. Build Movement Into the Day
Climbing, crawling, dancing — it all helps the brain wire itself.
5. Stay Calm During Big Emotions
Your calm nervous system teaches their nervous system how to reset.
6. Protect Sleep
Consistent bedtimes are a gift to their brain.
7. Read Every Day
Even 10 minutes has compounding benefits.
Why This Matters
Knowing how child’s brain develops changes how we see the small moments.
Suddenly a tantrum isn’t “bad behaviour” — it’s a brain still under construction.
A messy craft session isn’t “wasted time” — it’s neural wiring in action.
A silly conversation at bedtime? Language pathways forming in real time.
We don’t need to be perfect parents.
But we can be present ones.
And presence is what shapes the brain more than anything else.
A Gentle Conclusion
As parents, it’s easy to feel like we should be doing more — more activities, more learning, more “brain-boosting” moments. But the more I’ve read about how children’s brains grow, the more it’s clear that the small things we already do each day matter far more than anything fancy.
Talking together at breakfast.
Giving them a hug when they’re overwhelmed.
Reading the same book for the tenth night in a row.
Letting them play, imagine, and explore in their own way.
These ordinary moments are shaping their brains in ways we don’t always see. And that’s reassuring. We don’t have to be experts or perfect. We just have to be present enough, often enough.
And as always — you’re doing better than you think.
Want Simple, Brain-Building Play Ideas?
If you’d like practical, calm, low-prep activities that support your child’s brain development, you can download my toddler education activity sheets from our free resource library. This is a young but growing list of free activity sheets, routine sheets and wall art. We currently have some big activity packs in the making and will be available very soon for absolutely no cost. Our children deserve all they help we can give them to grow into confident individuals and this is my small way of trying to help us achieve that:
👉 Free Toddler Education Activity Sheets
It’s full of simple ideas that strengthen connection, confidence, and curiosity — without needing to buy anything new.
