Personalized 7th Birthday Lion Toddler Long Sleeve T-Shirt. A lion plays an electric guitar to celebrate the seven year old's 7th birthday. 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.