The provisions of Article 50, paragraph (2) and Article 69-18, paragraph (1) of the Revised Health Insurance Act apply to childbirth allowance paid to insured persons and former insured persons whose date of delivery is on or after the date of enforcement of this Act (hereinafter referred to as the "Effective Date"), and with regard to childbirth allowance paid to insured persons and former insured persons whose date of delivery is before the Effective Date, the provisions then in force continue to govern.