Personalized T-Rex Dinosaur 4th Birthday Baby Bib. A grumpy, purple T-Rex wearing a birthday hat sits and eats a birthday cupcake. Cute 4th birthday gift for your little 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"