In this article the author studies such functions of maternity rites cycle in traditional Tyvinian culture as cutting the umbilical cord, burial of the placenta, ablution, laying in the cradle. The examination of the rites has shown that they followed a strictly regulated procedure. The aims of the rites studied were to affect a newborn ritually, on the one hand, to gradually integrate a newborn in the society. On the other hand, it was to affect a woman in labor, to consecrate her and to qualify her for the new gender and age group of ‘adult women of her husband’s family’. In the first case the rites served to separate a newborn from a different world on the sacral level, to clear of different world’s marks, to endow the baby with vitality, to define gender and age status and to include it into a family and tribal group. Those rites accompanied with such rituals as washing a baby with specially-processed felt, dried manure, black tea, woolen thread, lambskin or kidskin, and involved such things as a knife or scissors and cradle. These things did not only help protect the newborn from evil spirits but also endowed it with solar sacred substance, defined tribe affiliation, and shaped the future. In the second case the rituals directed at consecrating a woman in labor and integrating her into her husband’s family were emphasized by feeding a woman with sacred nutrition, by the sacrifice of a sheep and by smoke purification.