Just wanted to relate my experience. We started potty training our daughter at 4 months. She was able to pick up and relate to letting go when sitting on the potty in around a week's time. Over time, she has learnt to hold back and keep her diaper as dry as possible. At 7 months, she completely stopped pooping in her diaper. One thing you do need to do is actively watch out for ways they will communicate when they have to go. My daughter did it by shrugging off everything else and holding her legs together in a shivery position. These days, sometimes she just motions her hands as though removing her diaper. During the initial phases, you tend to have a lot of false positives where you end up taking them to the potty for every small gesture you might think is their cue. Eventually you learn to recognize the pattern and also timing, etc. She's 9 months old now and unless we are careless, is usually good about not wetting her diaper. In fact, there are nights when she has held back and woken up with a dry diaper. I can't wait until she can communicate more effectively.

Tips and other things...
- We could not find a small enough potty. Babies R Us had a small portable Baby Bjorn potty that was available in white, blue or pink. When we started out, it was slightly big for my daughter.
- We put the potty on the countertop in the bathroom and have her sit facing the mirror. This is nice because it allows you to communicate and play with them. The mirror also fascinates them as they watch themselves, etc.