Ina May Gaskin on fear in childbirth

[@leilademian9410]

It's Sphincter law. The cervix is a sphincter. This group of muscles don't relax when a person is nervous. So while it may not be a pretty analogy, just like it would be difficult to pee or poop with someone watching you or telling you, "go RIGHT now", the cervix also has a harder time opening if the mother is nervous or uncomfortable.

[@DiotimaofMantinea]

I'm not saying I disbelieve this, but is there anything in the medical support this claim?