This pattern is written for 3 sizes:

12-18 month, foot length 13-13,5 cm / 5.25-5.5 inch
18-24 month, foot length 14-14,5 cm / 5.5-5.75 inch
24-36 month, foot length 15-15,5 cm / 6-6.25 inch

Suggested yarn: any Sport / Fine weight yarn or socks yarn.

You can use any yarn from your stash in case to obtain the gauge. See the information on the label when choosing the yarn. Recommended hook size – 3mm.