Personalized Little Elf 3rd Birthday Toddler Long Sleeve T-Shirt. Toddler Long Sleeve Tee - White for a little elf's 3rd birthday with a polka dotted number 3 and snowy striped North Pole sign. Perfect for Santa's helper on his or her Christmas birthday. 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.