Personalized My Daddy is the World’s Best Obstetrician Toddler Long Sleeve T-Shirt. My Daddy is the World’s Best Obstetrician Toddler Long Sleeve Tee - White has cute world’s best design with slogan for the son or daughter of an Obstetrician. A classic for Fall, Winter and Spring, these long sleeve toddler t-shirts are sure to be a staple in your child's wardrobe. Whether layered or alone, this t-shirt is soft yet durable enough to stand up to your toddler's playtime demands.