We're Number 1!   Kids Red Sox Dark Navy Adjustable Hat. New fabric is a blend of cotton and recycled polyester, Each cap contains approximately 2 20oz bottles worth of recycled plastic. The colors have been revamped to be deeper and brighter, resulting in a more vibrant cap, Logos are larger and feature cotton embroidery for a soft texture, Cap stitching is thicker and more pronounced, Interior details have been revamped including all new sweatband, taping details and a custom bronze button. All little fans should have one! Generally we say Inf - Newborn to 2 years, Tod - 2 years to 4 years, Kids -  4 years to 6 years, Youth - 6 years to 8 years, 8 years and up should move to adult sized hats.  Infant size may have alternate adjustable closure.  Get the adult version to match!