Personalized Monkey Little Sister Toddler Long Sleeve T-Shirt. Little sister Toddler Long Sleeve Tee - White with adorable little girl monkey ballerina in a pink tutu holding a bouquet of flowers says I'M THE LITTLE SISTER. 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.