Personalized Smart Biological Engineer Baby Bib. Biological engineering, the profession for intelligent people text with the letter E in the engineering wearing a hard hat is a funny design with attitude for engineers and college students at back to school, birthdays, holidays and graduation. 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"