Works up really quick using worsted weight yarn and hooks F and G (4.25 mm) for bigger sizes. Hook F (3.75) are used for sizes 0-3 and 3-6 months. It is worked in one solid color, so no changing colors for this one. Pattern includes 4 sizes:0-3, 3-6, 6-9 and 9-12 months. Pattern is written in Standard American terms and includes lots of pictures to guide you through every step. You can make it in slightly different shapes as seen in the pictures. Instructions for both styles are included. You need to know only basic crochet stitches for this one.