Dear Mr Brijesh,
What do you mean by "Women who are presently undergoing Maternity Leave.your query is not specific?
Please note Maternity Leave under The Maternity Benefit Act, 1961 is increased to 26 Weeks w.e.f 01/04/2017.Similarly Maternity Benefit has been enhanced to 26 Weeks from 20/01/2017 under ESIC.
Women Employees who are under Maternity Leave as on 31/03/2017 are also eligible for enhanced Maternity Leave of 26 Weeks