Personalized Happy Pi Day Math Symbol Pirate Newborn Layette. Funny happy Pirate Day Pi symbol math Newborn Layette - White has cute green pi wearing an eye patch for students or teachers. 100% combed ringspun cotton 5.8 ounce 1×1 baby rib sleeper. 3/8" flatlock binding at envelope neck and cuffs. Back sleeve flap to protect hands. Elastic opening at bottom. Infant: 0-3 Months