Personalized 50 Is Just A Number Toddler Long Sleeve T-Shirt. Happy 50th birthday! 50 is just a number. A BIG number! Fifty years is a long time, you know. 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.