In a new trend across UK, a mom-to-be singing workshop is being carried out at the Chelsea and Westminster Hospital; one of a growing number of classes using singing to help women prepare for birth, the Daily Mail reported.
Advocates claim singing helps mothers relax by increasing levels of endorphins and the happy hormone serotonin.
Mothers can bond with their unborn child as singing helps the baby recognise the mother's voice.
The breathing techniques learnt in singing classes also alleviate pain during labour, experts say.
This particular course - called Wombsong - is the first of its kind to be offered free to National Health Service patients, but private classes are also offered across UK.
"Singing will help control and slow the breath. Using those techniques to breathe deeply and slowly in labour can really calm your muscles and body," Maya Waldman, the teacher responsible for Wombsong, said.
The class begins with exercises to warm up the voice and body before the class launches into a Polynesian rowing song