This chart got 4 out of 4 right for me BUT there is another "700 year old Chinese birth chart" (which has been mentioned on here too) and it is completely different...and was completely wrong for me. Mind you if you happen to ovulate around the end of the month how do you know which month you conceived in? Dodgy!
This one is, I think, the chart that was printed in a parents mag about 10 years ago and it predicted a girl for almost every month when the mother is in the range 30 - 32, especially the summer months. Anybody bear this out?