I am in the habit of dancing with my 3 months old when she is cranky. She is colicky and it calms her down. I put on one of those MTV channels and we dance around. I was wondering if moving around too fast could be shaking her? I am holding her head and I don't do any jumps but when I move a little faster than "slow music" there are still vibrations. and I am worried. Should we only dance to slow music?