World Fertility Is Rapidly Falling To Replacement Rate

Fertility is falling and families are shrinking in places— such as Brazil, Indonesia, and even parts of India—that people think of as teeming with children....the fertility rate of half the world is now 2.1 or less—the magic number that is consistent with a stable population and is usually called “the replacement rate of fertility”. Sometime between 2020 and 2050 the world’s fertility rate will fall below the global replacement rate.

From "Falling fertility," Oct 29th 2009, The Economist print edition.

The Economist also estimates world population will peak around 2050 at 9 billion.