before modern medicine

so, before modern medicine the gender of the baby was decided via old wives tales, grandma's premonitions and other completely reliable methods.  while reading a random blog (yes i do that when bored)  i stumbled across this link:

http://www.thebump.com/calculators/ChineseGenderChart.aspx

it is a chinese gender chart.  i figured it be fun to see what they predict, before i get an 'official' modern medicine prediction.  it claims 90% accuracy, so i guess we'll see come november 5th if we are planning to have a little girl, or if we're in the 10% error range ; )