The Discovery Toys HAPPY CHILD has a surprise -- a cheery "Circle Song" that plays when you hold both hands. This soft, huggable doll features the technology of conductive fabric, so it also offers a wonderful way for little ones to explore cause-and-effect. Others can join the fun too; as long as the circle is complete, the music plays. Invites tactile exploration, listening skills, and social and emotional connections when baby snuggles on your lap with this cuddly friend or expands the circle to include many more! Requires three AG 13 button cell batteries (included). From 6 months -- Toddler