Months created by women?

I saw a sandi toksvig quote yesterday and it got me thinking. It was about how 28bdays had been marked on a prehistoric bone. So possibly it was women marking tjebdays of their cycle.

Idiotic. Preposterous. Most women today have 28 days cycles because it’s artificially imposed through hormonal contraception. In prehistory, that would certainly not be the case. Natural cycles are not usually 28days regularly, and then in prehistory you’d have issue of malnutrition and STIs delaying or suspending periods making them irregular. In addition, with no birth control, there’d be a lot of skipped periods due to pregnancy, and breastfeeding. I don’t know who Sandi Toksvig is, but they’re completely out of their depth.

Months are quite literally linguistically derived from moon.
A lunar month is 28 days and there are 13 in a year.

Womens natural menstrual cycles are very rarely exactly & regularly 28days long.

So no, women would not have invented months to track their menstrual cycle. That’s preposterous.

Having attended boarding school from 11 to 16 and had female flatmates throughout my 20s, our menstrual cycles did sync to a large extent. Contraceptive pills messed this up and the whole dorm wasnt synced, but my close friends and I were definitely all aligned during term times. It went wonky over summer hols (10 weeks long)

www.bbc.com/news/magazine-37256161.amp

No, months are roughly based on moon cycles (an old way of measuring time before set calendars was by the moon, hence phrases such as "many moons passed by").

Some women have 28 day cycles - mine when it was regular was 34 though. I suspect it's pure coincidence that human females ovulate roughly once a month - other mammals have different patterns.

Not in my experience.

Lunar calendars are easier for people to follow without the use of any technology (stone age or modern), but they don't work for anything that needs to be kept track of annually. 12 lunar months are about 10 or 11 days shorter that the time it takes for the Earth to orbit the sun once, ie one year. This is why the Muslim and Jewish religious festivals move around - those religious calendars are lunar.

When women live closely together, without any contraception or other intervention in their fertility, their cycles often begin to match each others. It can happen that they will all begin their periods within 24h of the first one beginning.

So I would think that a 28 day tally would be more likely to be women tracking when they were going to come on, than anyone tracking the moon.

I thought they were to do with phases of the moon.
Women’s cycles are all different lengths so who’s would you take to be the standard? And it is a myth that women’s menstrual cycles synchronise if they live together!