Personalized 3rd Birthday Bear 3 Year Old Outfit Toddler Long Sleeve T-Shirt. Cute bear with I'm three quote for a little boy or girl turning three years old comes on this 3rd birthday Toddler Long Sleeve Tee - White. 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.