DD is almost 4. While watching her at dancing class the other day, I saw her arm shake when she was doing a particular ballet move. The arm goes up over the head and then brought down slowly IYKWIM? Her arm was shaking as she brought it down. I mentioned it to DH and he said she was probably just sitting on a nerve which I thought was plausable. Then this morning I handed her a cup of tea and the same arm shook when she took it. Is this a normal thing or should I be getting her checked out?