When to Start Potty Training? The Yellow Chair Sat in the Corner for Three Weeks

I bought the little potty chair the week Liam turned nineteen months. It sat in the corner of the bathroom, cheerful and yellow, and for three weeks I looked at it every morning and thought the exact same thing: is it time yet, or am I already behind?

At pickup, everyone had a number. My sister-in-law swore both her kids were out of diapers before two. A mom I trust said she waited until almost three and it took a single weekend. My own mother said — in that gentle way that still somehow lands like a verdict — that I'd "left it a little late," and I hadn't even started. That was the part nobody warns you about. Not the accidents, not the laundry. The noise. Everyone was certain, every certainty was a different age, and I was standing in my bathroom with a yellow chair and no idea which age was supposed to be Liam's.

"He'll get there" is true. It just isn't about your kid.

The reassurance was kind, and it might even have been right. But it was advice for every toddler on earth, and I wanted to know about Liam. Every article I opened at midnight either told me not to worry or handed me a milestone chart that read like a countdown. Nothing that actually looked at my own son — where he was doing well, and the one or two places worth watching.

A friend from my old prenatal group is the one who finally helped, and she didn't do it with another opinion. Not a "free diagnosis" — a way to let an AI actually get to know Liam. It took about five minutes, one night after he'd gone down: a run of plain questions about what he can already do and what he can't yet, across all six areas of development — gross motor, fine motor, cognitive, social-emotional, language, and self-care, which is exactly where potty training lives. At the end there was no score. The AI had learned who my son is.

So I tried the little experiment that sold me on it. I took a single question and put it to both: "What age should I start potty training my son?"

I asked a generic AI:

There's no magic age. Most kids land somewhere between 18 and 30 months when it happens, but the number matters less than the readiness signs: staying dry for around two hours, telling you when he's wet or has gone, showing curiosity about the toilet, being able to pull his own pants up and down, and following a simple instruction. Watch for those, and start when they show up — no pressure.

There's nothing wrong with that. It's genuinely sound advice. But it's the exact advice you'd get for any two-year-old anywhere — Liam is nowhere in it.

I asked firstk, which already knew Liam:

Liam is solid on gross and fine motor for his age — he can already work elastic-waist pants down on his own. And from what you told me, three of those readiness signs already show up in him: he stays dry for a couple of hours, he tells you right after he's gone, and he trails you into the bathroom, curious about the whole business. So this was never really an age question — Liam is already showing you he's ready. Over the next few weeks, offer the potty at predictable moments (after waking, after meals), keep him in easy-off clothes, and celebrate the tries without ever punishing the misses. The science behind this — the SBP's guidance and the Denver II screening framework pediatricians actually use — describes readiness as signs in the child, not a fixed number on a calendar.

Skeptical? Drop that same question into ChatGPT yourself and hold the two answers side by side.

It wasn't that the AI was cleverer. It was that Liam himself was in the answer — and that it finally showed me age had been the wrong question the whole time. What settled my worry wasn't a number on the calendar. It was who he actually is.

The weight I'd been carrying since that chair showed up finally shifted. Not because anyone handed me the magic month, but because I'd stopped needing one. The next morning I moved the potty chair out of the corner and into the middle of the bathroom, where Liam could see it — no red circle on the calendar, no test I was already failing. Just my son, and the readiness he'd been showing me the whole time.

The skeptic in me had her questions, so I'll answer them the way I wanted them answered: it's free, it took about five minutes, and it never once told me Liam was "behind" or stuck a label on him — it isn't a diagnosis, and it said so plainly: if something ever truly worried me, that's a conversation for his pediatrician, not a chatbot. What it gave me instead was the thing that yellow chair and all those pickup-line verdicts never did — the readiness my own son was already showing, with his name on it.

If you carry that same question around, the next step is a small one: let the AI get to know your kid, and trade the age on the calendar for the signs he's already giving you.