That is fine. Please provide a link. I should not have to do my own research to confirm this statement. Also, it does not support your original assertion. Child mortality could have been much lower or much higher thousands of years ago. Your 60% seems to have no basis in factual data. 1800 was not thousands of years ago.
I am not disputing that infant mortality was exceedingly high it is just your statement has no empirical data to support it. Also, what do you mean by thousands of years ago? Roman times? There is very little data for this in just looking doing some quick searches I have found estimates anywhere from 20-50%. Bronze age? Stone Age?
There also seems to be some evidence that precontract native societies had a much lower child mortality rate than postcontact. Finally there is also a big difference between infant mortality and childhood mortality.
the health conditions of our ancestors were such that 43% of the world's newborns died before their 5th birthday.
So 43% is not the infant mortality rate(newborns) but childhood mortality rate.
Again, I do not disagree that infant and childhood mortality was much higher in the past. I have a problem with a specific number being given to a vague time period. Also, I have a problem with the extrapolation that if mortality was higher in 1800 it must have been much higher "thousands of years ago".
I want to see the data not hear assertions.
Facts don't lie or have an agenda. Facts are just facts
"God did it" is not an argument. It is an excuse for intellectual laziness.
If your viewpoint has merits and facts to back it up why would you have to lie?