Personalized Cordelia and Birds Believe in Yourself Toddler Long Sleeve T-Shirt. If you believe in yourself, you can achieve whatever you set your mind to. Cordelia and Birds Believe in Yourself Toddler Long Sleeve Tee - Heather, from the children's book "Cordelia" by 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.