Mine is a right wriggler when Im in the bath, I think it does somersaults in there sometimes! I think it's a combination of the heat, the noise and the movement of the water. Plus you are sitting still so more likely to notice the movements.
Bath time is one of the things I will miss about being pregnant. It's one of my favourite times of the day, lying there in the heat with hubby chatting watching our little wriggler!
xx