As for the actual method of meditation, for a toddler? Well that's tricky.

I imagine that you'd have to turn it into a toy or a game.

Interesting question.

Ever notice how some people don't get 'stuck' in their negative habits and brain loops? Like they can just let them go. If they get feedback from the world they can take it seriously and act on it, instead of digging in their heels and getting resentful. Being able to do this reliably and under stress in the wide variety of life circumstances, and getting closer and closer to doing it in real-time, is the goal.

Sufficiently-developed attention gives you insight into how your brain is constructing what you perceive as reality, leading to a reduction in ego, permanent reduction in baseline suffering, and a pervading sense of unity with the rest of the universe.

Stay away from us to their own benefit, of course.

They become more familiar with it, thus replacing habit with intelligence.

This leads to increased power and freedom, among other things.

But I don't think it should be confounded with medical advice or treated as causal to neurodiversity or called mandatory. Probably why that person is getting downvoted.