Personalized Farty Forty Toddler Long Sleeve T-Shirt. You're farty! I mean forty. Happy birthday, you old fart. Funny gift for your favorite 40 year old's flatulent 40th bday. 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.