Purchased the pink and blue Wombmates hats to complete the set for my triplets. They have received many compliments on them in the Nicu. I purchased the preemie size for my 28 weekers. They were just over 2 lbs when I first put them on them. They were slightly big then. Once the babies were about 2.5 lb they fit perfectly. And they still fit at about 3.5 lb. however, they won''''t much longer! I wish they were preshrunk. They did get significantly smaller once washed. Other than that, they are adorable hats. NOTE from Pat - for tiny preemie things, please hand wash in cold water and best to line dry or tumble. We have not heard that these shrunk before but thank you for the information, I will try them myself. Head sizes vary too so we can''''t fit 2 lbs and 5 lbs with the same item often.