Personalized Worlds Best Athletic Trainer Daddy Baby Bodysuit. My Daddy is the Worlds Best Athletic Trainer Baby Bodysuit - Sunset has cute worlds best design with slogan for the son or daughter of an Athletic Trainer. 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.