Kickee Pants' Brazil Collection Kickee Pants' signature Muffin RuffleFootie now comes with the option of a zipper! Easy on and off. Just perfect for those middle of the night changes. Sizes Preemie through 6-9 months are the Classic Layette fit, while size 9-12 and up are Fitted. Not treated with flame retardant. 95% Viscose from Bamboo, 5% Spandex