Personalized It's My Birthday Toddler Long Sleeve T-Shirt. It's My Birthday! A cute little cupcake is dancing with joy because it's your birthday! Cute birthday gift for that special someone! 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.