Personalized Happy Pi Day Math Holiday Baby Bib. Pi Day Baby Bib - White and Orange has cute baked pie filled with math symbols. Fun shirt for students or teachers on Pi Day. 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"