The first 1000 days of parenting: An interview with neuroscience educator Nathan Wallis

By GymbaROO

Parenting in 2026 is a strange paradox. We have more information than any generation before us, yet many of us feel less sure than ever. We’re swimming in advice, doom-scrolling conflicting opinions, and second-guessing instincts that once felt obvious.

That’s the headspace I was in when I sat down with Nathan Wallis — neuroscience educator, father, grandfather, and author of What Were You Thinking!? — for a conversation that felt less like a lecture and more like a debrief with someone who actually gets it.

One of his core messages, backed by decades of brain research, is disarmingly simple:

The first 1000 days matter.

The four “brains” your child is building.

Nathan uses a framework that instantly reframes everyday behaviour. Instead of talking about one brain, he talks about four “brains” that build in order:

• Brain #1 — the brainstem: regulation, survival, fight-or-flight
• Brain #2 — the sensorimotor system: movement, rhythm, reflex integration
• Brain #3 — the limbic system: emotion and attachment
• Brain #4 — the frontal cortex: planning, focus, higher thinking

Here’s the kicker: you can’t jump straight to Brain #4.

“You simply cannot get to the higher-order skills of planning and emotional control without a solid physical foundation,” Nathan explains.

Throughout his book, he returns to the nurturing relationship between a young child and a primary caregiver during the first 1000 days, including pregnancy. The way we engage with our children in this window can shape how they engage with their environment for the rest of their lives.

He also pushes the old nature-versus-nurture debate into something more nuanced. From a neuroscientist’s perspective, around 70% of our brain development is probably influenced by nurture. Creativity in the early years, he says, is critical for both intelligence and resilience. He points to global shifts in education — including China’s policy implemented move towards play-based learning only for under-sevens — as signs that systems are slowly catching up with what the science has been saying for years.

Pause and reflect: When you think about your own childhood, which “brain” do you feel was most supported, and which one might have been rushed or ignored?

You are the “most important teacher”

One of Nathan’s central messages is quietly radical, in a GymbaROO kind of way:

You are your child’s most important teacher.

Not the centre. Not the screens. Not the carefully curated activities.

Structured environments and resources can absolutely support development. But the most powerful influence is the adult a child feels safest with.

Nathan highlights things many of us dismiss as “just what you do with babies”:

• That instinctive, sing-song voice we slide into — parentese — is not silly. It’s a powerful tool for auditory development and bonding.
• The deep breath you take before responding to a meltdown isn’t a “hack”; it’s co-regulation. Infants are exquisitely tuned to your nervous system.

Without these actions, we will struggle to develop brain 1 and 2 at a foundational level! Hence his rule of thumb: parent calm equals child calm.

For a generation that’s been told to optimise, outsource and endlessly self-improve, something is grounding about hearing that what matters most is your relationships, not your perfection.

Part 2 of this article coming soon.