The one child policy has led to a big demographic problem in China - a lot of elderly people with not enough workers to support them. That is part of the reason it has changed and also it is unpopular and coercive.
China's government has literally changed the birth rule of 1 child per couple to 2 children per couple. Is this a good decision. Source CNN news?
Considering how many baby girls I had read about that were being abandoned because the families wanted boys, I say it is about time.