Why Do Human Mothers Feel So Much Pain During Child Birth

This is another post on the Man and Animal series. I had earlier written about rape in man and animals and the cause of difference between man and animals.

The current one is about the excruciating pain that human mothers feel during child birth. The question is: do all mothers feel roughly the same pain or do human being feel and / or express a lot more.

Here are some nice articles on the subject:

1. http://www.slate.com/articles/health_and_science/explainer/2012/09/animals_giving_birth_dolphins_bear_newborns_easily_but_hyenas_risk_death_.html: The ratio of the size of the new born (say 3kg baby in humans) in relation to the size of the mother (say 60kg) can be compared across species. The higher the ratio the more difficult the child birth can be. Nice analysis isn't it?
2. https://www.quora.com/Why-is-the-human-birth-seemingly-more-painful-than-other-mammals: This one again is lovely. Bipeds have a narrower hip and human heads are larger than heads in other species with the result that getting the human baby out is much more arduous.
3. http://community.babycenter.com/post/a24011163/are_we_the_only_animals_with_painful_births: This brings out the point that expression of pain in other species is likely to result in danger from predators to the mother and new borns and hence the mother does not express the pain. Extrapolate (from my earlier article that surmised that human beings think and emote much more than other species) and we can possibly explain why human being cry out a lot more. A quote from the link: "Animals have limited ways to express their feelings and my guess is that birth is painful for many animals, just like it is for many women. There are some women who have experienced pain free and even orgasmic births, but they are a rarity. The majority of women do experience pain and I think likely so do most animals, they just don't have the ability to express it the way we do."
4. http://psychologyofwellbeing.com/201005/why-is-childbirth-so-freakin-painful.html:  I have included this article because it discusses the issue while providing no answer to the question (had this article been submitted in response to my question, I would have rated it "F"). 

Additional reading:

• Inbreeding: https://davidcavill.wordpress.com/a-beginners-guide-to-inbreeding-and-line-breeding/
• Pain in animals (a nice instructive video): https://video.scroll.in/827043/watch-this-is-how-animals-experience-pain-which-they-cannot-always-convey
• http://vbala99.blogspot.com/2016/08/difference-between-man-and-other-animals.html