Aunty Vi....that is EXACTLY what I always thought!! I was sooo confused because Noah's didn't fit anything of what I had read. Then I had another BW friend of mine (Nicole~MomtoMegan) tell me that her DD's would escalate and could be quite dramatic but was definitely different from the-real-deal cry, and that made me think twice of how I was jumping in on Noah. That's why I wanted to post on here, as hearing someone else say they had the same experience as me with the situation shed so much light on it. It's so hard too, because with spirited babies, when you intervene they often get even more worked up and it's even harder to get them to sleep, so it's a fine line. At the beginning when I wasn't sure yet if that really was his version of mantra or not, I told myself I would wait 15 minutes TOPS before going in (and would go in right away if it was genuinely crying/disress, of course), and at the 13 minute mark he stopped and was out cold. So, that got me thinking, and I started to pay closer attention to it and realized that one of the key factors was that he had moments in the fussing where he would stop. It was often only for about 7-10 seconds or so, but he would stop just the same. In a real cry, he certainly doesn't stop, not even for a moment; he cries and cries until he gets what he's asking for.
That really opened my eyes, and I started to see that he did it every time, almost without fail. So, now it is very clear and the two cries sound so different, though at the beginning I was as confused as I could possibly be because of how similar they sounded at that time.
I hope that helps!! It's WONDERFUL once you find out that it really is a mantra cry, as it makes the path to independent sleep quicker and easier for everyone involved! Gotta love those spirited babies of ours!!