Personalized 1st Birthday Sailing Boat Girls T-Shirt. 1st Birthday cute pink sailboat T-Shirt - White has design with I'm One slogan and number 1. 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.