My daughter is 6 but she is tiny (38lbs) and the XS (5/6) fits perfectly, I also bought a Small in case the XS doesn't fit and it doesn't make much of a difference for her since she is tall. Since they fit under her school jumper, the length doesn't matter. The photos show the difference in length and sleeves between the XS and SM models. Thanks for saving me money on school shirts!
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