Personalized Pi Day Math Party Buffalo Plaid Infant Romper. Funny Pi Day symbol for a school math party or just to celebrate a love of Pi Meet your new favorite outfit! Keep dressing simple with this one piece, lap shoulder t-romper. Super soft and perfect for baby's sensitive skin. 5.5 oz. 100% combed ringspun cotton premium jersey (CVC Colors are 60/40; Heather is 90/10 combed ringspun cotton/polyester)