Here is the size chart for selecting the Watery Remington Girls Swimsuit. For this swimsuit, height and hip-to-leg measurements are used to determine your correct size.
If you happen to be between two sizes, choose the one that is either closest or according to your preferred fit. You need to determine which fit you prefer; for a tight fit, choose the smaller of the two sizes, and for a looser fit, choose the larger of the two sizes.