[akd]

How about this possible solution? If you're employed by a company and you want to take maternity or paternity leave beyond a standard period, you have to quit your job. Your employer is given a lump sum payment from the government to cover the cost of finding your replacement, based on some metrics such as the salary of the position. These payments are covered by an increase in payroll tax for all employees.

That way, all companies are shouldering the burden of people having children, so they have no real reason to discriminate against women likely to become pregnant.