Did my daughter bought the ball with 5 months and she loved it immediately. She is completely fascinated by the floating duck and colorful kungeln the ball and trying all the time to grab the ball and clean bite (which will not work). Since she has the ball tries to constantly come up with the one way or another behind the ball afterwards, maybe she is learning by crawling faster, who knows. The ball animated play and explore with no frills and effort, just super!