Personalized Ketosis Butter Toddler Long Sleeve T-Shirt. Toddler Long Sleeve Tee - Black for ketogenic dieters on a high fat low carb regimen says Ketosis You Had Me At Butter. Perfect for LCHF advocates. 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.