A fork of Rural Dictionary
One who encourages childbearing, either out of some practical or religious belief that human populations were designed to grow naturally, or one who believes human populations should grow nearly as large as possible, to benefit nearly as many people as reasonably possible.
A pronatalist is likely to be offended by a draconian anti-child policy, such as China's "one child" policy.
Pronatalists naturally oppose human population "control."