; and (B) any additional paid vacation or sick leave provided by the employing office to such employee. (3) Substitution An employee may elect to substitute for any leave under such section 102(a)(1) any other paid leave which is available to such employee for that purpose. The previous sentence shall not be construed to require that an employee first use all or any portion of the other paid leave before being allowed to use the paid family leave described in this subsection. (4) Additional rules Paid family leave under this subsection— (A) shall be payable from any appropriation or fund available for salaries or expenses for positions within the employing office; and (B) if not used by the covered employee before the end of the 12-month period (as referred to in section 102(a)(1) of the Family and Medical Leave Act of 1993 ( 29 U.S.C. 2612(a)(1) )) to which it relates, shall not accumulate for any subsequent use. . (b) Effective date The amendment made by this section shall not be effective with respect to any birth or placement occurring before the end of the 6-month period beginning on the date of the enactment of this Act. 4. Conforming amendment to Family and Medical Leave Act for GAO employees (a) Amendment to Family and Medical Leave Act of 1993 Section 102(d) of the Family and Medical Leave Act of 1993 ( 29 U.S.C. 2612(d) ) is amended by adding at the end the following: (3) Special rule for GAO employees (A) In general Any leave under subsection (a)(1) taken by an employee of the Government Accountability Office shall be paid leave. (B) Amount of paid leave The paid leave that is available to such an employee for purposes of subparagraph (A) is— (i) the number of weeks of paid family leave in connection with the birth or placement involved that correspond to the number of administrative workweeks of paid family leave available to Federal employees under section 6382(d)(3)(A) of title 5, United States Code