I believe that pre-natal medical leave is authorized by the attending OB-GYN. There are some other interesting points, though in this MCO. It’s dated 2004, and appears to be the most current.
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4. d. Billeting
(1) Per reference (a), a pregnant active duty servicewoman with no
family members may reside in bachelor quarters for her full term. If the
pregnant servicewomen requests, the host commander may authorize her to
occupy off-base housing up to her 20th week of pregnancy. From the 20th week
onward, the host commander must approve a request to occupy off-base housing.
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14. a. The servicewoman’s CO may grant a period of convalescent leave for an
active duty servicewoman who is not fit for duty and requires additional
medical care as recommended by her OB HCP. The length of convalescent leave
will normally be 42 days after discharge from the MTF following any
uncomplicated vaginal delivery or cesarean section. The servicewoman may
terminate leave earlier with approval from an HCP.
b. It is the responsibility of the servicewoman to report any
complications or medical problems that she has experienced during
convalescent leave to her attending physician. The attending physician may
then recommend an extension beyond the standard 42 days based on the
servicewoman’s clinical circumstances. The HCP must certify that the patient
is not fit for duty, will not need hospitalization during the contemplated
convalescent leave period, and that such leave will not delay the final
disposition of the patient. The servicewoman’s permanent command must be
notified of this recommendation.
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21. h. Staff Judge Advocate to CMC (SJA). Will coordinate to ensure that
appropriate judge advocates provide legal assistance relating to Marines’
options in establishing paternity and obtaining child support.