as far as i know yes the o/s stands for one size infant i looked and looked online what i found was info but not a size chart. im guessing they fit until
Elastic at the wrist and a zipper adjuster at the cuff give these mittens a snug fit; and the fleece nose wipe on the thumb takes care of the inevitable cold-weather sniffle factor. Leatherette on the palm is perfect for getting a grip on sippy cups or favorite toys. Features
Shell: 100% nylon Dobby Rainstop™ II or 100% nylon Swirvy Durvy Print or 100% nylon Vempest Embossed Hydracloth. Lining: 100% polyester polyfleece. Insulation: 100% polyester 100g Hollofil Elastic at wrist Nose wipe on thumb
Fanned, and watching. Have a feeling these are gonna go high at the last second with so many people watching and the time left. Luckily I have enough credits, cuz my son could REALLY use these, his hands get so cold.