Personalized Daddy Worlds best Postal Worker Baby Bib. My Daddy is the Worlds Best Postal Worker child's Fathers Day Baby Bib - White and Blue gift idea. 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"