45 C.F.R. § 86.57 – Marital or parental status.

(a) General. A recipient shall not apply any policy or take any employment action:
1. (1) Concerning the potential marital, parental, or family status of an employee or applicant for employment which treats persons differently on the basis of sex; or
2. (2) Which is based upon whether an employee or applicant for employment is the head of household or principal wage earner in such employee's or applicant's family unit.
(b) Pregnancy. A recipient shall not discriminate against or exclude from employment any employee or applicant for employment on the basis of pregnancy, childbirth, false pregnancy, termination of pregnancy, or recovery therefrom.
(c) Pregnancy as a temporary disability. A recipient shall treat pregnancy, childbirth, false pregnancy, termination of pregnancy, and recovery therefrom and any temporary disability resulting therefrom as any other temporary disability for all job related purposes, including commencement, duration and extensions of leave, payment of disability income, accrual of seniority and any other benefit or service, and reinstatement, and under any fringe benefit offered to employees by virtue of employment.
(d) Pregnancy leave. In the case of a recipient which does not maintain a leave policy for its employees, or in the case of an employee with insufficient leave or accrued employment time to qualify for leave under such a policy, a recipient shall treat pregnancy, childbirth, false pregnancy, termination of pregnancy and recovery therefrom as a justification for a leave of absence without pay for a reasonable period of time, at the conclusion of which the employee shall be reinstated to the status which she held when the leave began or to a comparable position, without decrease in rate of compensation or loss of promotional opportunities, or any other right or privilege of employment.
(Secs. 901, 902, Education Amendments of 1972, 86 Stat. 373, 374; 20 U.S.C. 1681, 1682)