Personalized Third Grade Rocks Baby Bib. Third grade rocks text with three happy rocks holding 3rd grade flags is a funny design for back to school, 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"