Personalized Chemistry Small Heart Toddler Long Sleeve T-Shirt. Chemistry text with a heart dotting the i in chemistry is a fun gift design for teachers, students and chemists at back to school, birthdays, holidays and graduation 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.