Personalized Structural Engineering Smile Toddler Long Sleeve T-Shirt. Structural engineering text forming a smiling face with the text makes me smile is a humorous structural engineering design for birthdays, holidays nad 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.