Personalized Math Smile Baby Bib. A smiling face made from math text with the caption, Makes me smile is a humorous gift design for mathematicians, math students and teachers at back to school, graduation, birthdays and holidays. 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"