The knitting pattern provides full instructions for 4 sizes XS (0-3 months), S (3-6 months), M (6-9 months) & L (9-12 months) and there are lots of step by step photos to help you throughout the knitting and simple makeup. These wonderful booties are worked flat on 2 single pointed needles size 3mm with any dk yarn of your choice so no difficult circular knitting on 4 needles.