Personalized Bee Future Big Sister T-Shirt. Future big sister T-Shirt - White with an adorable bumble bee with red heart wings says I'M GOING TO BEE A BIG SISTER! Little red hearts over the "i"s. Wardrobe essential for looking good, 24/7. 5.0 oz., pre-shrunk 100% cotton. Seamless 1x1 rib collar. Shoulder-to-shoulder taping. Double-needle stitched sleeves, bottom hem and front neck. Note: greys are a cotton/polyester blend.