Personalized Going to be a Big Sister Rainbow for Girls Toddler Long Sleeve T-Shirt. cute rainbow for your daughter to announce she is going to be a big sister now 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.