In 1977 a state hospital near Paris began quietly changing the way women gave birth. Obstetrician, Dr Michel Odent, believed that childbirth had become too medicalised and he wanted a more natural approach. He introduced a pool to ease the pain of labour. Eventually some babies were even born in the pool. Claire Bowes speaks to Dr Odent about the innovation that has become a revolution using the power of water.(Photo: Getty Images)