[Soldier Boy]

They shouldn't even need "training" (kids are not dogs) in my experience, just generally understanding the use of the toilet and getting the gist should be enough? Suggests there will be other things going on TBH. My youngest was still totally non-verbal until she was at least 5, but was out of nappies by 3. There hadn't been any "talking" about it - because there couldn't have been.

Honestly I think part of the problem is people being overly weird/private about "bathroom stuff" with kids these days. If a kid knows how their parents/siblings use the toilet, they will start using the toilet. It's very, very simple and basic human (and not just even human) nature. Mimicry is how they learn.