Personalized Baseball 1st Birthday Toddler Long Sleeve T-Shirt. Baseball league sports 1st birthday boy with baseball bats. Cute sports themed 1-year-old b-day baby party gifts. Happy Birthday one-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.