World population growth rate and birth rates are steadily decreasing. That doesn't mean things are not increasing but that the increase is beginning to go down. The United States birth rate, right now, is barely up to replacing and, without immigrants we would be in trouble. As 3rd world gets better their birth rates too tend to get less. I have been told that happens when folks no longer need as many children as possible to care for them when they get old (may or may not be true) You can google all this stuff. Here is an example: