Yes, everything I purchased that needed different sizes (clothing, baby booties, etc.) would give the pattern for the smallest size, then in brackets [] the other sizes. Before starting, it would state the needed materials (including the suggested hook size), the sizes (like small, medium, large), the finished sizes (in inches or other measurement) and the gauges (like 13 sc = 2"; 7 sc rows = 3/4", etc.), and finally any additional notes for anything that may be a bit different than typical.
Then the pattern starts. An example of one of the rows could be: Rows 10-129 [10-137, 10-153, 10-161]: Working this row in back lps, ch 1, sc in each stitch across (75) [83, 91, 96].
What that means is there are four sizes. The first size is rows 10-129, the second size has more rows as you go through rows 10-137, the second has 153 rows, and the 4th size has 161 rows. At the end of those rows, you have the number of stiches at the end: 75, 83, 91, 96. In this case, no stitches were added, just rows.
Sometimes it's how many stiches you may add or start with. For example, Row 1: Ch 97 [101, 105], sc in 2nd ch from hook, sc in each ch across, turn (96 sc) [100 sc, 104 sc].
This one has three sizes, and the only difference is the number of stitches in the row.
RE: NEXT GOAL ON MY BUCKET LIST!