The reason why you can't have water when giving birth is to prevent the risk of aspiration, inhaling vomit or fluid into the lungs, which can cause severe lung inflammation or even death and Mendelson's Syndrome.
Water is usually restricted mainly for high risk pregnancies and when you're at a high risk of complications or might require general anesthesia.
Although if you're a low risk pregnancy then you can often have water, ice chips or clear liquids when giving birth, even for water births.
The pain scale for childbirth from 1-10 is is also often a 10 on the pain scale.
Pain scales of 7 to 10 are common for severe labor pain, although many pregnant women also experience peak pain in the 7 to 10 range without any medication.
And other pregnant women find the pain of childbirth to be manageable with support.
First time pregnant women often rate the pain scale of their childbirth at a 7 to 8 although some also rate their pain scale of childbirth a 10.
Women that have gone through more than one pregnancy often say the pain scale is 6 to 7.
Pain management and coping skills can really help ease the pain and discomfort of giving birth.
Giving birth is painful and also so hard for humans as a result of evolutionary conflict or even obstetrical dilemma, between walking upright, which requires a narrow pelvis for efficiency as well as having large brained babies that need a wider birth canal to exit the mothers womb.
The large brained babies create a tight fit, in which the baby's large head and shoulders must also navigate a complex and twisted canal, which often requires the baby to rotate significantly, which makes it a long and painful and risky process unlike in other primates.
Us humans bipedalism or walking upright narrowed the pelvis for efficient walking, and large brains demanded a larger fetal head, which created a bottleneck for childbirth.
The human baby's head is also large relative to the mother's birth canal, which makes it a very tight squeeze, unlike in most other mammals.
And the pelvic canal is also twisted and is shaped differently at the top and bottom, which requires the baby to rotate 90 degrees during birth also known as internal rotation to align the baby's head and shoulders for passage.
And a baby's shoulders are also wide, relative to the mothers birth canal, which also adds to the difficulty and requires extra maneuvering.
And meeting the metabolic needs of a large brained baby and the energy also demands of prolonged breastfeeding also add to the physiological stress and so this combination of factors also result in relatively helpless newborns that make human birth become a prolonged and assisted process.