This is my Baby Superfast Slouch hat Circular knitting pattern.
You can make this hat in less than an hour. Its worked in the round on circular 8 mm knitting needles.
The knitting pattern provides instructions for 4 sizes XS (preemie), S (newborn) M (baby) L (toddler) so can be made for any baby / small child with a head circumference between 12-20 inches.