You are talking out of your ass about shit you don't understand.
1 out of every 2 children dying before the age of 5 isn't a sourceless fact, that is a fact of demographic reality that is well documented in the anthropological literature. Like I said. You're talking out of your ass about things you don't even understand.
Child Mortality
In 1800 the health conditions of our ancestors were such that 43% of the world’s newborns died before their 5th birthday. These estimates are shown in the visualisation below.
In the time series plot below I show child mortality over the long run. Today child mortality in industrialized countries is below 5 per 1,000 live births. The time series plot shows that these low mortality rates are a very recent development, and in pre-modern countries child mortality rates were between 300 and 500 per 1,000 live births.
Child Mortality
This is a very recent development and was only reached after a hundredfold decline in child mortality in these countries. In early-modern times, child mortality was very high; in 18th century Sweden every third child died, and in 19th century Germany every second child died. With declining poverty and increasing knowledge and service in the health sector, child mortality around the world is declining very rapidly: Global child mortality fell from 18.2% in 1960 to 4.3% in 2015; while 4.3% is still too high, this is a substantial achievement.
With dipshits like you, it will be again soon. Do you think these diseases just don't exist anymore, you fucking moron? No, the reason children don't die to them is because our healthcare is better, including vaccines, and our nutrition is better.
Just shut the fuck up. People like you, who live in ignorance so profound you can't possibly even fathom what you don't know, are an embarassment to humanity.
The diseases are just as prevalent, THE VACCINES ARE WHAT KEEPS THEM FROM KILLING PEOPLE and when you don't vaccinate your children properly you are FUCKING HERD IMMUNITY.
Seriously. Shut the fuck up.