This ball has a lot of potential, still didn't do the trick for my baby.
We gave it to her when she was 9M as specified, but she was never interested in crawling to get the ball or the crawling wheel that you can make of it.
The ball doesn't even go straight in one line since one of the ends is heavier and the magnet holding them together is not that strong so they fall apart sometimes. The blue end with the little balls was of some interest, carrying one of the discs from time to time, or in rare occasions taking them apart, but the whole ball or the crawling wheel wasn't.