Personalized Blue Octopus Uncle's Sweetheart T-Shirt. Looking for a gift for a special little girl in your life? Check out our Blue Octopus Uncle's Sweetheart design! This cute and kawaii design is perfect for any little girl who is your uncle's girl, baby, or child! The design features a blue octopus with hearts and the phrase "Mommy's Sweetheart" written in a playful font. 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.