Future retirees can claim in certain specific situations additional quarters granted "free of charge" This is called insurance duration increases. The best known is that granted for maternity and child rearing (MDA) It is provided for in all basic pension plans, both private and public, and in most special plans.
In the private sector, for mothers close to retirement age, this increase is 8 quarters for each of their children born before 2010. It is used to calculate the duration of insurance, all plans combined, used to determine the liquidation rate.