Personalized Sun Stick Girl Little Sister Toddler Long Sleeve T-Shirt. Little sister Toddler Long Sleeve Tee - White with a funny, little cartoon stick figure baby in diapers wearing a pink T-shirt with a sun on the front. She 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.