How to Fit a Boy's Speedo
- 1). Check the label on a pair of the boy's pants to see what size they are. You're looking for a number between 6 and 20. This will give you an idea of what size Speedo he will wear.
- 2). Measure the boy's waist in inches.
- 3). Measure the boy's chest in inches.
- 4). Consult the Speedo size chart to select the size that best corresponds to the boy's measurements. Look under each even-numbered clothing size for the measurements that would fit the boy comfortably. For example, if he wears a size 10 in clothing, but has a 27-inch waist, choose the Large size Speedo instead of the Medium just in case.
Source...