The One-Child policy isn't a hard policy wherein you are punished physically or imprisoned for having more than one child, it's a fine, albeit quite heavy, hence why the average number of children in China in 2016 is 1.62 which exceeds 1 child per family because half of Chinese parents had around 2 children during the One-Child Policy.

The reason why you're being downvoted is because the One-Child policy is actually quite popular in China. A Pew Global survey in 2008 found 76% of Chinese approve of the One-Child Policy (Scroll to Additional Findings section in link cited).

https://en.wikipedia.org/wiki/One-child_policy

http://www.pewglobal.org/2008/07/22/the-chinese-celebrate-th...