In a developed country such as the France, one can legitimately wonder about the potentially harmful effects of routine iron supplementation for a population of pregnant women mainly not anaemic. In Great Britain of the recently published recommendations are pronounced against a systematic supplementation of iron in pregnant women. Other European authors advocate focused on the rate of ferritin supplementation. However, we are lacking of studies allowing, from clinical criteria and biological precise, to better target pregnant women who could benefit from supplementation of iron in the first quarter.