Big Bang Baby
The Science of How Your Child’s Universe Takes Shape
How do your child’s skills develop, and what can you do to support them?
In Big Bang Baby, Kinedu founder and father of four Luis Garza Sada explores how early skills connect, why children develop at different paces, and how play, relationships, and everyday routines help them learn.
The questions behind the everyday moments.
Why does one new skill seem to unlock others?
How movement, language, thinking, and emotions develop together.
Why do children reach milestones at different times?
Why the timing varies, and what milestones can and can’t tell you about your child.
How can you help without turning every moment into a lesson?
The role of play, warm relationships, clear limits, and familiar routines.
A universe taking shape.
Early skills are closely connected. As children grow, those skills become more distinct. Big Bang Baby uses the expanding universe as a metaphor for understanding that change.
A new way to understand the child in front of you.
Start with a broken banana.
From the introduction of Big Bang Baby.
But reality for any parent looks very different. It looks like a father sitting on the kitchen floor at 7:15 in the morning, trying to make the school carpool on time while running late for work, “holding space” for a three-year-old who is screaming because her banana broke in half. The father knows, somewhere deep in the rational part of his brain, that this is developmentally normal. He has read the posts. He understands that a three-year-old does not yet have the capacity to regulate an intense emotional response. He is trying to do the right thing.
The right thing, as described by the parenting internet, involves narrating the child’s emotions back to her (“I see that you’re feeling frustrated about the banana”), validating the experience (“It’s okay to feel sad when something breaks”), and waiting for the storm to pass without any further guidance on emotional regulation or any adult authority that would get the morning back on track.
Meanwhile, three other children need breakfast, school starts in twenty minutes, and the broken banana is now on the floor.
And what can you do to support them?
Four everyday forces the book keeps coming back to.
Play
The small moments that look like nothing and build everything.
Relationships
Held by you, pushed by you, and through you: that’s how your child builds their model of the world.
Stress
It will always be there. What matters is that you, the buffer, are there too.
Predictability
The single most important thing a parent should know, according to Dr. Phil Fisher.
What you’ll find inside.
The Old Cosmology
Where today’s parenting advice comes from, and why it so often contradicts itself. What the classic theories reveal about how children think, learn, connect, and build a sense of self.
The Big Bang
What’s happening beneath the first smiles, sounds, and steps: how early skills connect, why children follow different timelines, and how everyday experiences help new abilities emerge.
The Universe Takes Shape
Development from birth to age five, and your role along the way. From first words and pretend play to friendships and big feelings, how children’s abilities become more distinct and work together in new ways.
“Building Your Map” takeaways throughout the book, a parent’s guide to the Kinedu research, a plain-language glossary, and a research primer for readers who want to go deeper.
Luis Garza Sada
Founder of Kinedu. Father of four.
Luis brings his experience building Kinedu and raising four daughters to the questions at the heart of Big Bang Baby: how children develop, and how parents can support them. For more than sixteen years he has worked with early-childhood researchers and educators, and read the questions parents send in at two in the morning. The book sits at that intersection: the science of the first years, and the everyday reality of raising small children.
Meet the author →
Get your copy of Big Bang Baby.
- Kindle edition, $9.99 USD
- In English
- 23 September 2026
- Paperback coming soon