Personalized Big Sis Christmas Sister Announcement Toddler Long Sleeve T-Shirt. I'm going to be a Big Sis cute Christmas tree holiday sister announcement Toddler Long Sleeve Tee - Vintage Smoke outfit for girls. 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.