Personalized Whale Big Sister Toddler Long Sleeve T-Shirt. Big sister Toddler Long Sleeve Tee - White with a cute pink spouting whale in the ocean. Colorful text says BIG 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.