Personalized World’s Best ER Doctor Daddy Baby Bodysuit. My Daddy is the World’s Best ER Doctor Baby Bodysuit - White has cute world’s best design with slogan for the son or daughter of an ER Doctor. Our unisex one piece baby bodysuit make great gift for newborns, babies, infants, baby showers and expectant moms. An ideal gift for any new parent who will want one in every color.