Experiments galore in this fun and bright science print! Burt's Bees boy two piece pajama sets are perfect for Big Kid, and kids. Stretchy organic cotton rib fabric is nice and cozy, and extra-stretch cuffs are sized just right. Featuring a slim and snug fit to follow regulated safety standards, use the size guide to make sure your little one will fit right in! Size: 12. Color: gray. Gender: male.