The Nazis also undertook measures to increase the number of Nordics in Germany. The Lebensborn program was only open to German women who fit the Nordic profile. During the Nazi occupation of Poland, the Nazis took young Nordic-looking Polish children who were classified as being descended from ethnic German settlers in order to determine whether or not they were "racially valuable". If that were the case, the young children were taken back to these Lebensborn houses so they could be raised as Germans.