Personalized 3rd Birthday 3 Year Old alphabet Toddler Long Sleeve T-Shirt. 3rd Birthday Toddler Long Sleeve Tee - Charcoal has A B C look who's three third birthday quote and stacked alphabet blocks for a boy or girl turning 3 years 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.