Personalized It's My Birthday! Toddler Long Sleeve T-Shirt. It's My Birthday! A birthday cake carrying a birthday present is rushing to celebrate your birthday! Cute b-day gift 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.