The crazy thing is there has only been 1.6 billion seconds since 1970. There have been more babies since 1970 than there have been seconds. Which is crazy. Back then, Earth's population was on 3.7 billion. Now it's 7.8 billion. That means that (ignoring deaths) 2.5 babies have been born for each unix second. Or roughly 1 baby every 400 milliseconds.
Also, see: https://www.worldometers.info/