Evidently the mother of the octuplets born this week already had six children when she took fertility drugs to have more. 
Family: Octuplets' mother has 6 other children - Yahoo! News

WHITTIER, Calif. ? The woman who gave birth to octuplets this week has six other children and never expected to have eight more when she took fertility treatment, her mother said.
Family: Octuplets' mother has 6 other children - Yahoo! News