Pension rules mean that women who leave work to raise children receive smaller sums of cash when they retire.
Opting out of work to have a family means that many women fail to be eligible for a full state pension.
Women who retire over the next ten years will get an average £40 a week less than men from their state pension, according to new research.
Figures revealed by the Department of Work and Pensions show that women could be up to £2,000 a year worse off due to current pension rules.
Women tend to lose out on a full entitlement to a state pension because they take time out of paid work to have children. However, many men qualify for their full pension pot and, in some cases, higher Additional pension payments because they work for longer and earn more money than women.