The Woolie is a really wonderful all purpose boot that will quickly become an indispensable part of your baby's wardrobe! Not only will your baby love its super soft, cozy feel - but you will appreciate how easily it slips on and off and adjusts to any size foot. Great for strollers, front packs, car seats, night-time sleeping. Because of the adjustable ankle - you can slip this on any size foot from 0-12 months and it will stay on. One Size Fits Infant thru 12 months This shoe is very practical and a great value- with most shoe styles you will go thru 3 or 4 sizes in the first 12 months of your baby's life as they grow soooooooo fast! With a Woolie - one size will fit from day one thru their first birthday - a full year of use. 100% Made in USA