I kind of like cryin' babies--makes me smile and remember those days. Just glad I don't have to look after them
I have never been on a flight where a crying kid was so over the top that it ruined my flight. I have had the odd adult that couldn't stop talking on the in seat phone--now THAT was annoying.
I have had seats taken out and had to listen to a moaning and groaning patient on a stretcher next to me flying up north. I was compassionate enough not to let that get to me although it was a bit trying as you mostly feel sorry for their predicament and there is nothing you can do to assist.