Personalized Big Sis with Lil Bro Girls Sister Announcement Toddler Long Sleeve T-Shirt. Big sis sibling Toddler Long Sleeve Tee - Vintage Smoke has design with sister mouse in pink and little boy mouse brother in blue. 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.