Personalized Blue Octopus Uncle's Sweetheart Youth Long Sleeve 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. youth long sleeve t-shirt. Shoulder-to-shoulder taping. Youth: S(6/8), M(10/12), L(14/16), XL(18/20)