Crochet Baby Hat made in the Half double Crochet stitch, in the first 4 baby sizes. Fast and easy crochet baby hat pattern. Undoubtedly the most popular baby item to crochet is a baby hat. I find the HDC (Half double Crochet makes a super quick hat. I have included the first few sizes of the little newborn baby hat to fit Newborn0-3 months, 3-6 months, and a slightly larger infant baby.