Personalized What If It's the Best Summer Yet? Toddler Long Sleeve T-Shirt. Make every summer the "best summer" with What If It's the Best Summer Yet? Toddler Long Sleeve Tee - Light Blue, featuring Jonathan James from "Jonathan James and the Whatif Monster" 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.