Our Swimmies are styled after a more euro-fit. Meaning, the length of the shorts will land anywhere between a little above the knee to mid-thigh-ish (depending on the length of the child). It is designed this way--its our style! Our sizes are true-to-size based on the child's age. What this means is the average sized kid--about 50% on the growth charts--is used as the barometer for waist sizing. If you have a child who's age fits evenly between the ranges, or you know is larger than average, it might be best to size up rather than to size down.   Waistband Sizing: 6 months - 12 months - 41cm 12 months - 18 months - 43cm 18 months - 24 months - 45cm 2 years - 3 years - 47cm 4 years - 5 years - 49cm 6 years+ - 51cm *Measurements are of a relaxed circumference.