Personalized Super Trex 4th Birthday Baby Bib. Rawr! A Trex superhero wearing a birthday hat is surrounded by a colorful burst of confetti. Cool 4th birthday gift for your 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"