Personalized I'm One Toddler Long Sleeve T-Shirt. I'm One! A foam finger and hand number one with "one" spelled out with a 1 in the O. Is there any doubt who is number one! Cute gift for any little sports fan. 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.