My son is 8 years old, 51" tall, 24kg, 22" waist (so definitely skinny but still in the middle percentile for his age). I ordered size 6 and they fit perfectly - snug but not too tight. He loves her. There is a size chart on the Speedo website that I used to determine. If you are unsure I would pay close attention and order by your waist measurement as that is where the suit is narrowest.
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