This baby's sport cap is so cute! It is easy and quick to crochet! It is perfect for your baby boy to wear on a spring day. And it looks great on girls too! Material: With different weight yarn, there are 6 sizes as bellow: Baby Sport yarn, Hook: 4.00 mm (US 6) Cap circumference: Approx. 17", 19"; 6 - 12 mos (The sample cap on the baby boy in cover picture) DK yarn/Light worsted yarn, Hook: 4.25mm (US G) Cap circumference: Approx. 18", 20"; Toddler - 3y Worsted yarn (Caron brand "Simply Soft") Hook: 4.25mm (US G) Cap circumference: Approx. 19", 21" Toddler: 3y - preteen I also added a lot of step-by-step photos and tutorial videos to help you to work through this project. This pattern is copyrighted. You may not resell, trade. No mass production allowed.