So Penny likes to make noise. I taught her to make noise when I pat her mouth. She then progressed to use this ball to pat her mouth but with no noise. Yesterday, she added the noise and wouldn't stop. This is her favorite toy. It came with some stacking cups from Julia and its the perfect size to grasp. She smiles with excitement whenever we shake it at her. Aaaaaand she squeals like this all the time. It started in Barrow........and has progressed ever since. Never angry squeals , always happy. She's such a good baby.