Originally Posted by Xrayman
folic acid is for the prevention of spina bifida-it has NOTHING to do with sex determination.
by using the billings method, you can fairly well determine the sex of your child.
the theory is: for a boy, sex must occur ONCE on the day of ovulation-male sperms are fast and meet the ovum quickly, therefore conception occurs with them.
for a girl, sex must occur before ovulation so that the males die off by the time of ovulation, the slower more resilient female sperms then reach the ovum.
the theory seems to work as we have a boy and a girl, that were determined by this method-it could be coincidence-but we're happy!!!