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! This swimsuit has a spandex lining. 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. 6 months - 12 months - 41cm Waistband 12 months - 18 months - 43cm Waistband18 months - 24 months - 45cm Waistband2 years - 3 years - 47cm Waistband4 years - 5 years - 49cm Waistband 6 years - 7 years - 52cm Waistband