Drinking Wine During Pregnancy

Hi - I just stumbled upon this dispute on eQuibbly entitled "if you don't stop drinking our child will get fetal alcohol syndrome" ... and I wonder just how true is it that drinking moderate wine is totally fine when you're pregnant. I just think that you can't be that careless with your baby's health, that even a drop of alcohol may cause harm. Should pregnant women then abstain 100% from alcohol altogether? And if so, is it safe to go back to drinking after child birth? Thanks!