The coziest jammies ever! Our zippy one-piece pajama is made from the softest, premium Bamboo Viscose. We've added extra features like fold-over feet and mittens, a 2-way zipper for easy diaper changes, and no irritating tags for extra comfort for your baby and toddlers. They are super stretchy to allow for longer wear than your standard pajamas, so you can be sure to get maximum use from our Zipper Pajamas. * 95% Viscose from Bamboo, 5% Spandex, 220-230 GSM * Fold-over hand & foot cuffs in all sizes * Two-way YKK zipper * Sized generously in length to allow for longer wear compared to cotton pjs * Tight-fitting to comply with CPSC regulations We recommend sizing down from cotton pajama sizing. Model #1 is wearing size 12-18 months and is 30 inches, 20 pounds. Model #2 is wearing size newborn and is 21 inches, 8.5 pounds. Model #3 is wearing size 6-12 months and is 29.5 inches, 24 pounds.