Personalized 4th Grade Teacher Best Baby Bib. 4th Grade Teacher Baby Bib - Heather and White has cute school pencil design with Worlds Best Fourth Grade Teacher saying. 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"