Personalized Chemistry Smiley Toddler Long Sleeve T-Shirt. A smiling yellow face made from chemistry text with the caption Chemistry makes me smile is a humorous chemistry design. 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.