I am jumping in here. so please don't axe me about the following - just my opinion - it made sense to me
I read (internet?!? - I'll try and find it again and post it later) that there were studies done on babies cries - heck how do I explain it - there is not a difference between crying (Pain I think is the exception on the rule. That any idiot can tell) But apparently babies cry the same for everything else. Say example that she has wind, she wil cry at the same tone(?) than she would cry if she were overstimulated, if her diper was wet, if she was teething ect. So in other words, you are not really suppose to make out a difference in cries. Its just that the longer you have your child, the better you can guess what is wrong. So if she has not had something to drink in four hours and she starts crying, you will guess that she's hungry. If she drinks/eat someting and she stops, your right, but if she keeps on crying you guess diper. You change diper, she keeps crying, you try something different.
This sounds horrible - I do not explain things well. But any-hoo, it help me, because I aslo did not instictivly know what she was crying about and everybody told me that later I would learn what her differnt cries means. (WHAT!?!) I still don't know most of the time, I am always guessing what's wrong or what is bothering her.
I think that mothers that distinguish between "different" cries are - like me - good guessers