This pattern will fit a baby about 6 to 12 months, or with a 16 to 18 inch head (see my list of crochet head and hat measurements and how to calculate them). To make the hat larger, add more increasing rounds to the crown. To make it smaller, take away an increasing round. I have marked the increasing rounds below.
See my tutorial to learn how to work in the round.
Double Crochet Baby Boy Sun Hat (6 to 9 months)
Hook: G/6 4.25 mm
Yarn: Worsted, Medium, 4 (I used Red Heart Super Saver in Delft Blue and Pumpkin)
Tapestry needle to sew in tails
Scissors to cut the tails
Crown of Hat
CH 1 counts as first DC unless otherwise indicated. Most use a CH 2 with a double crochet, but I like CH 1 because it creates a neater join for each round.
CH 3, join with a SL ST to form a ring
Round 1: CH 1. Work 10 DC in ring (11 DC total). Join to beginning CH 1 with a SL ST.
Round 2: CH 1. Work a DC in the same stitch. Then work 2 DC in each DC space around (24 DC total). Join to beginning CH 1 with a SL ST.
Round 3: CH 1. Work a DC in the next stitch. Work 1 DC in each stitch around. Join to beginning CH 1 with a SL ST.
Round 4: CH 1. Work a DC in the same stitch. Then, work 1 DC in the next space. *Work 2 DC in the next space. Work 1 DC in the next space.* Repeat from * all the way around. Join to beginning CH 1 with a SL ST. (36 DC total).