Demonstrating its firm commitment to the one-child law, China has barred 21 people from taking up positions as lawmakers or political advisors in northeast Liaoning province for breaking the strictly-enforced rule.
With more than 1.3 billion population, China has been implementing the one-child norm for the last two decades which, it says, has helped it to check demographic growth.
"Violation of family planning policy has become a veto criterion in the election of lawmakers and political advisors at all levels", Mu Weiyong, Vice-Director of the provincial population and family planning commission said.
Liaoning province also imposed tougher penalties on the Communist Party of China members, cadres and "model workers".
"Apart from being fined, they will have a permanent black mark on their records and they will be barred from future awards and honours", Wu was quoted as saying by the official Xinhua news agency.
Liaoning is facing gender imbalance as in 13 of its 14 cities. Gender imbalance has been attributed to the traditional preference for boys with some Chinese women choosing abortion after learning through ultrasound that they were carrying girls, a pattern seen since late 1980s.
The sex ration for newborns in China is 119 boys to 100 girls, a trend which has fuelled fears that many men of marriageable age would find it hard to get life partners.
China says that its one-child norm has averted about 400 million births but it is facing demands for recasting the policy to tackle problems such as widening gender imbalance and fast-ageing society.
Chinas population is projected to reach 1.5 billion by 2030s.