Thanks! err...that's great to know. As for advices, there were quite a few, including one that said just drop one in to see how it goes, so I followed that one with close monitoring. I also decided to feed earlier cos the mice I bought was getting bigger day by day and I am concerned that waiting one more week....I might get 1) attached to the mice...(I keep rats as pets) and 2) it gets too big for the ball.
I fed 2 because the first I fed was a small hopper, and I realize it was simply just a snack, it was my first time feeding a ball. I decided then to follow thru with the bigger one, as I realize my ball can probably handle it after all, and he did with surprising ease.
As for acclimating, I think some babies acclimate faster, from what I can tell from my ball's behaviour, he's curious and confident since day one.....so I decided to go ahead with an earlier feeding.
I think as a free forum, one can ask advice, gets loads of advice and just choose one...I cannot choose to follow all advice since some might be contradictory, so hope that didn't offend anyone's sensibilities. I am grateful for all the feedback.