Personalized Baseball 5th Birthday Toddler Long Sleeve T-Shirt. 5th birthday baseball boy. Baseball league style with bats and varsity letters. Cute sports theme for your 5-year-old's b-day. Happy Birthday five-year-old! 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.