I think Elimination Communication is more about the communication between the caregiver and the child, it only seems natural to be in tune with baby's elimination patterns when we already can tell when little ones are tired, fussy, overstimulated, hungry, or uncomfortable without them actually telling us verbally.
For us starting EC pretty much cut down on the amount of crying at 2 mo (maybe they stop crying around this time anyway, though). I could not figure out what was wrong with her when she would wake up 20 minutes into a deep sleep. But then it was like "ah ha!" , that is what she is trying to tell us!
Then it started to get fun, catching pees and trying to read the small signals (grunting, squirming, fussing, etc.) that dd gave us before she wanted to go.
Of course baby still has many wet diapers during the day, but we get the majority of the pees and poops in the potty. Easier laundry and clean up for me!
Anybody who is curious should give it a try! I find that after nap pees are the easiest to catch since babies don't usually pee in their sleep. :)
Happy ECing!
Liane