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There were the Juvie models for Necromunda, but those are hard to find. I know that the Judge Dredd miniatures game also has Juvies, but I don't think they'll work quite as well because they're sold mostly as single models, so it's not cheap, and they tend to have awesome and wild hair styles, but I'll link them here anyways if you're interested.
http://www.mongoosepublishing.com/miniatures/judge-dredd/punksandjuves.html

 godardc wrote:

Do you know the height of the Judge Dread juve ?

I do not unfortunately, I do not own them, they just happened to come to mind. I believe the Judges themselves are around the size of space marines, and would have to assume that the Juvies would be a little shorter than the Judges, but I am not sure. I do know it is a 28mm game however, so they can't be too far out of scale with actual guardsmen.

If you are having issues looking for child soldier minis, I may give a suggestion if you're using them as conscripts, Victoria minis makes a great looking set of Penal Guard minis that work well, and I believe they are in scale with Cadian minis. Personally, my Cadian conscripts are Cadian guardsmen with a white stripe down the center of the helmets to make them stand out from the rest of the army and just call them whiteshields.