(A) No wife’s or husband’s insurance benefit shall be reduced under this subsection— (i) for any month before the first month for which there is in effect a certificate filed by him or her with the Commissioner of Social Security, in accordance with regulations prescribed by the Commissioner of Social Security, in which he or she elects to receive wife’s or husband’s insurance benefits reduced as provided in this subsection, or (ii) for any month in which he or she has in his or her care (individually or jointly with the person on whose wages and self-employment income the wife’s or husband’s insurance benefit is based) a child of such person entitled to child’s insurance benefits.

(B) Any certificate described in subparagraph (A)(i) shall be effective for purposes of this subsection (and for purposes of preventing deductions under section 403(c)(2) of this title )— (i) for the month in which it is filed and for any month thereafter, and (ii) for months, in the period designated by the individual filing such certificate, of one or more consecutive months (not exceeding 12) immediately preceding the month in which such certificate is filed; except that such certificate shall not be effective for any month before the month in which he or she attains age 62, nor shall it be effective for any month to which subparagraph (A)(ii) applies.

(C) If an individual does not have in his or her care a child described in subparagraph (A)(ii) in the first month for which he or she is entitled to a wife’s or husband’s insurance benefit, and if such first month is a month before the month in which he or she attains retirement age (as defined in section 416( l ) of this title), he or she shall be deemed to have filed in such first month the certificate described in subparagraph (A)(i).

(D) No widow’s or widower’s insurance benefit for a month in which he or she has in his or her care a child of his or her deceased spouse (or deceased former spouse) entitled to child’s insurance benefits shall be reduced under this subsection below the amount to which he or she would have been entitled had he or she been entitled for such month to mother’s or father’s insurance benefits on the basis of his or her deceased spouse’s (or deceased former spouse’s) wages and self-employment income.