Preemies come in all sizes, so gauge is not critical when making this hat. It may be a little smaller or larger and still be perfect for a preemie! Take care to choose a yarn that is soft to the touch and that contains no wool. Acrylic and cotton yarns are preferred to avoid any itching or allergies. Also, be sure to securely attach buttons so that little mouths and hands can’t grab hold of them. I hope you enjoy helping preemies have cute hats like other babies!