[qwerty456127]

This is a very interesting question. I don't even know whether it actually is good for children to meditate. "Inner dialogue" may be necessary for a young mind to develop. I believe development of mindfulness and silencing of the inner dialogue is a stage of development a person is meant to reach as they become adults. Those who don't reach it become old while keeping immature.

[bnjms]

Correct me if mistaken but isn’t the goal of mindfulness meditation to accept the inner dialogue rather than fighting it?

For instance at one point as a child I had a conscience that would talk to me but as I grew older the voice passed into the background. Now my thoughts are the sort of jumbled mess meditators talk about.

So I don’t understand why developing the ability to hear and accept these other voices would be a detriment.

[qwerty456127]

It's not the goal, it's the way. It disappears as you actually learn to observe it and everything mindfully all the time. E.g. now I only have inner dialogue when I choose to entertain myself this way and some times I feel too lazy even for this.