According to the Coalition for Positive Outcomes in Pregnancy, before becoming pregnant a woman needs at least four months to recover from exposure to harmful substances and to build a good nutritional supply.
Rasedushooldusega tegelevate organisatsioonide liit teatab, et naisel tuleks vähemalt neli kuud enne rasestumist vältida kokkupuudet kahjulike ainetega ning varustada organismi vajalike toitainetega.