Personalized Happy Pi Day Math Lover Party Baby Bib. Pi Day math themed Baby Bib - Blue and White has pi symbols in a pie. Fun gift for a geek, math teacher, college math major or any math lover. Our Baby Bib is rated high in convenience and durability and with a variety of fashionable colors, your baby can be trendy. Mix and match to any outfit. 100% cotton ring spun combed heather colors are cotton-poly. Width 7.75", Length 11.75"