The most sensitive part for me was the cervix and my 2nd child was breach (feet first). I'd be standing and talking to someone and suddenly I'd jump or twitch and make funny faces and they'd look all worried and say "Are you okay?!" "Yes, I'm fine, the baby's just kicking me." Rotten child was dancing on my cervix and it was so uncomfortable! At 36 weeks, they did an external version to get him head down and I was SO much more comfortable after that!