I had a waterbirth at the hospital two weeks ago and she had the cord wrapped around her neck once. They periodically checked me with a doppler (which I hated- every time my midwife touched me with it I'd have another contraction) and at one point the heartrate dropped, that's how they knew. My midwife didn't tell me what was going on but said, ok with this next contraction let's just push this baby all the way out... afterwards she told me why. Baby was fine and my waterbirth was amazing! I labored for two hours at home in the tub, and gave birth one hour after I arrived at the hospital! A far cry from my first birth- 3 day induced labor with a broken tailbone, vacuum extraction, and 4th degree tears!