No. There were certainly births, although most children died, either gassed, killed by guards, or due to malnutrition/exposure. Some women, particularly non-Jewish political detainees, could avoid deportation if they revealed their pregnancy, but others were deported anyway. If you are asking if women had sex and got pregnant by male prisoners, I don't have sources on that, but others may have been raped and impregnated by guards (although they would likely have been killed along with any resulting children). For some accounts of pregnant women in Ravensbrück, see A Train In Winter by Caroline Moorhead. (On mobile, sorry for not linking.)