Judy Garland in Oz .. and Shirley Temple in 'The Good Ship Lollypop' .. amongst many others .. the standard of 'child' acting just gets better & better
Richard Attenborough in 'The Guinea Pig' (1942) in which he played a schoolboy. He was actually 23 at the time and his early bald spot had to be disguised with a 'piece'
Loved Brian Glover in that, like my P.E. teacher he thought he was a bit special. Even at 14 I knew how put someone into the radiators in the gym while in full flight with a ball at their feet.
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More recently I thought Kevin Hernandez was very, very good in How I Spent My Summer Vacation. Underrated movie that.
:-)