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Home » Transcript: We’re Not Having Enough Kids – It’s A Disaster: Stephen J. Shaw on TRIGGERnometry

Transcript: We’re Not Having Enough Kids – It’s A Disaster: Stephen J. Shaw on TRIGGERnometry

Read the full transcript of data scientist, demographer, and filmmaker Stephen J. Shaw’s interview on TRIGGERnometry Podcast with hosts Konstantin Kisin and Francis Foster on “The Fertility Crisis: Understanding the Birth Gap”, September 17, 2025.

Welcome Back to TRIGGERnometry

KONSTANTIN KISIN: Stephen Shaw, welcome back to TRIGGERnometry. Great to have you on.

STEPHEN J. SHAW: Thanks for the invite.

KONSTANTIN KISIN: Well, you obviously, we talked with you, I think it was last year, about your documentary Birth Gap, talking about the fertility crisis across the world now, not just the Western world, but across the Western world, which is basically the fact we’re not having enough children to replace the population as we have now. We talked about many of the challenges that poses.

I think the stat that really stood out for a lot of people from that interview is in Japan, where you live, more adult nappies are sold than baby nappies. So there’s more nappies for people who in the final stages of life than for babies. And this is a thing that is increasingly being replicated around the world and you now have some new data and you’ve done a lot more research into this.

So talk to us about where the world is in respect to all of that. Just remind people and then what have you discovered about why it is that way?

The Stroller Statistics and Growing Awareness

STEPHEN J. SHAW: I’ll add just one thing about nappies. I believe it’s not the case for strollers as well. I think stroller sales for pets are now outstripping strollers for kids. That’s in South Korea and I believe it’s true in Japan too. So things aren’t getting better anywhere.

And you’re right, what’s happening in the Far East, I’m still based in Tokyo, is absolutely playing out. So it was two years ago I was here and at that time, I would say fertility came into the mainstream press once or twice a year. I mean, it just wasn’t a thing. Us too, it’s now almost daily. So the transition of awareness is the one big change I notice.

And that’s a good thing because one of the reasons for making the documentary was to make people aware of what’s actually happening. But you’re right, over the past two years I’ve been doing more research because I still wasn’t convinced that we really understand this crisis.

Groundbreaking Research on Mothers and Fertility

My first paper, now peer reviewed, I can say that I tend to make documentaries first and then do the peer review after, which is probably the wrong way around to some people. But I think this is so important that people need to be aware of certain things.

And the peer reviewed research really shows that mothers in Japan and the UK are having around the same number of children as 1970 mothers. Let’s just park the category of women because there’s no such thing as a debatable category nowadays. To me it’s like a Schrödinger’s cat. People are not going to like me for this. The idea of a cat that’s half alive and half dead. So park that analogy.

But the idea of an average person, mother or father, is someone with a child and childless at the same time. We measure these average people, demographers do it, and it’s held a lot of people back, I think, in fully understanding exactly what’s happening.

So original research separated people who are having children. We’ve got so much data on women, it’s terrible, really. I’m always talking about women and mothers. I really want to talk about men more and I hope to do that here.

But looking at the data for women, if you become a mother, 1970s Japan, 2025 Japan, you’re going on to have around the same number of children. UK too. In US, mothers are actually having more, from 2.4 to 2.6. So this is not to do about parenthood, this is to do with the transition into parenthood.

The Discovery in Kyoto: A Singular Explanation

But I felt, well from my first research, that’s as far as you could go, that it was obvious parenthood was being delayed. So I had this category delayed parenthood, people doing other things first and running out of time. What I didn’t expect to find one layer deeper was a pattern across 39 nations that explains everything, and I mean everything.

So I’m now on camera on TRIGGERnometry for the first time saying there is a singular reason for falling birth rates. And I’ll either be laughed at for that, or people might look back and think, oh, that’s interesting. I hope it’s the latter.

So if I can take you through for a moment. Last June I was in Kyoto, Japan, and I just finished all the data analysis for the first paper, literally just finished it. And I went out for an evening and a friend I was due to meet was double booked for a birthday party. So I had an evening to myself and I do what I’d like to do on Friday nights. Let’s do some more data analysis.

And I decided to do only one thing, which was, okay, let’s just prep the data for the next paper, which is going to be about the probability of being a parent by age. That was always in my mind. And I threw this into a visualized dashboard data tool and age apparent, it became a curve.

I’ll not go into too much now because you may have more questions first, but I can share with you. The latest research is what I call vitality. And it shows that the age of parenthood can predict birth rates with very high accuracy.

But it’s not your age, it’s everybody else’s age. Well, it’s other people are the problem. You see, it doesn’t matter if that’s helpful. It doesn’t matter if we decide to have a child younger. In the overall average of things, someone having a child will replace someone else. Not having a child all balances out.

What I mean is it’s a societal thing.