Sizing
The pattern can be knit in any weight of yarn, and you may make more or less squares for a smaller or larger finished blanket.
Squares will measure approximately 7.5 (8, 9) inches square for sock (DK, worsted / aran) weight yarns.
The baby-blanket sized sample is made in sock weight yarn and is 30 x 37.5 inches (20 squares).
Yarn
Amounts given are for 1 square:
sock or 4-ply: 70 yds per square
DK weight: 75 yds per square
worsted / aran: 80 yds per square
(baby blanket shown in Jamieson & Smith Jumper Weight, 20 squares, weighs 225 g, in colours: 23, 91, 121, 125, 93, 1403, 9113, 1280, 75, FC34, 132, FC41, 142)
Gauge
I recommend that you knit a square using suggested needles, block it and see if you like the finished size and density. This will also confirm the yardage (weight) you require per square.
Needles
sock or 4-ply: US #5 / 3.75 mm
DK weight: US #6 / 4 mm
worsted / aran: US #8 / 5 mm
Notions
stitch markers, darning needle