Personalized Mechanical Engineering Genius Baby Bib. Mechanical engineering genius text with a line of gears is a unique gift design with attitude for engineers and students at back to school, birthdays, holiday 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"