Ten years ago, there were many breaches of the regulations here, but not any more. The township offers incentives to families to stick to the policy, such as low-interest loans. According to the station's medical director, Dr Liu Yung, they explain to couples the advantages and disadvantages of each method. The village of Ding Xie Wa nestles in the shadow of an enormous state chemical plant in Yengsheng county, south of Beijing. The villagers divide their working hours between the factory and the local fields.
Times are tough and it is hard to make ends meet.
Liu Zhi Feng is 35. Her husband is a part-time taxi driver. They have a tiny plot of land that she tends with her father, who lives with them. Her humble house, in a courtyard off the main street, is basic but spotless. There is only a curtain dividing a window between her house and that of her neighbours, whose conversations you can hear clearly.