Personalized Dinosaur 4th Birthday Baby Bib. A dinosaur apatosaurus (or brontosaurus to the grandparents) stands tall over the 4 for the fourth birthday. Happy 4th birthday to the four year old! 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"