I have an 8 year old child of average build (slim but tall and strong but not sticky). I ordered 10-12 because their size interferes with 7/8 work. I also have a five year old. 10/12 looked like the right fit for my kindergartener (no exaggeration). The arms were too tight around the wrists and too short for my 8 year old. Other than that, it was a really really cute shirt and decent material, if a bit see-through (but it's a white shirt after all). If it wasn't for the size it would be cute! I think if you want to take a risk order 2 sizes up and it might work.
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