Personalized White Math Smile Baby Bib. A math smile with the smiling face composed of the word math is a funny gift design for mathematics students and teachers. 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"