Personalized This will be the Best Birthday Ever Toddler Long Sleeve T-Shirt. While all birthdays are worth celebrating, this one will be the best ever! This will be the Best Birthday Ever Toddler Long Sleeve Tee - Light Blue, featuring Mouse from the children's book "Dog and Mouse" my Michelle Nelson-Schmidt. 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.