Personalized Pi Day Baby Girl Cute Math Baby Bib. Pi Day design for girls has pink Pi math logo and says Daddys little cutie Pi. 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"