Personalized World's Greatest Nephew Baby T-Shirt. For all the "greatest" people out there! Get your World's Greatest nephew Baby T-Shirt - White today! Colorful baby tee that’s ready for a name or your own funny baby quote or insider family joke. The only thing ‘cuter’ than babies themselves. 100% ring-spun cotton. Ribbed crew neck. Taped shoulder-to-shoulder. Double-needle hem sleeves and bottom. White is sewn with 100% cotton thread.