I had my 18 week OB appointment today. The kids came with me as it is usually a pretty quick appointment. The Doc found the baby's heartbeat - and noted what a little jumper the baby is. Last month, he or she was jumping all over the place also. I didn't feel any of the jumping the baby was doing while listening for the heartbeat today, but I have started feeling other movement. So the movement I FEEL must be HUGE jumps and somersaults.
After waiting in the room with the older kids for a good 25 minutes, I can attest that the baby comes by the jumping quite naturally!