Personalized Body Builder Toddler Long Sleeve T-Shirt. Bio Engineer, body builder text with a strand of DNA is a humorous design for biological engineers. Fun gifts for bioengineers at 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.