This is another, longer video, on the same topic as last video.
As a midwife I know that this type of birth is very real. What prevents women from experiencing birth in this way is mainly to do with fear and interventions that are imposed on them. Of course a few women will have problems associated with pregnancy and birth and this is why it is important to have skilled birth attendant, a midwife, who knows when to stand back and let things happen and when it is important to step in and intervene or to seek specialist assistance. However at least 85% of women should be able to birth in this way if only they trust themselves and their ability to do this and have care givers who believe in them.