Jordy loves his... at a couple of months of age he was able to lie on his back and press the button & roll the other 2 things with his feet

Then he would grab the vertical bar of the cot with the hand closer to the edge, and swing his other arm up to play with it (thus sortta lieing on his side)

And now he stands and plays with it

I think we are still on the original set of batteries, though they are definitely not full charge but it still operates the fishies

Definitely a good purchase - great for hand-eye coordination in bed