Here's the law, according to the Family Medical Leave Act (posted through the Department of Labor's website):
Covered employers must grant an eligible employee up to a total of 12 workweeks of unpaid leave during any 12-month period for one or more of the following reasons:
for the birth and care of the newborn child of the employee; for placement with the employee of a son or daughter for adoption or foster care; to care for an immediate family member (spouse, child, or parent)... more