Personalized Baseball 4th Birthday Toddler Long Sleeve T-Shirt. Baseball league sports style 4th birthday boy with baseball bats. Cute sports themed 4-year-old b-day party gifts. Happy Birthday four-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.