Personalized Big Sis Whale Girls Sister Toddler Long Sleeve T-Shirt. Big Sis announcement Toddler Long Sleeve Tee - Vintage Smoke has cute whale design for a girl who is now a new 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.