Personalized Whatif Monster Toddler Long Sleeve T-Shirt. What if you took that chance, and discovered just how great you are? Whatif Monster Toddler Long Sleeve Tee - White from the children's book, "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.