49. In any suit under this Act, the Court may from time to time pass such interim orders and make such provisions in the final decree as it may deem just and proper with respect to the custody, maintenance and education of the children under the age of sixteen years, the marriage of whose parents is the subject of such-suit, and may, after the final decree upon application, by petition for this purpose, make, revoke, suspend or vary from time to time all such orders and provisions with respect to the custody, maintenance and education of such children as might have been made by such final decree or by interim orders in case the suit for obtaining such decree were still pending.