One special category was that of young women recruited to act as nannies; Hitler argued that many women would like to have children, and many of them were restricted by the lack of domestic help.[13] (This was one of many efforts made to promote the birth rate.)[14] Since the nannies would be in close company with German children as well as in a position where they might be sexually exploited, they were required to be suitable for Germanization.[15] Himmler spoke of thus winning back German blood and benefiting the women, too, who would have a social rise through working in Germany and even the chance to marry there.[13] They could be assigned only to families with many children who would properly train the nannies as well.[13] These assignments were carried out by the NS-Frauenschaft.[16] Originally, this recruitment was carried out only in the annexed territories of Poland, but the lack of women who passed screening extended it to all of Poland, and also to occupied territories in USSR.[15]