zuò yuè zi
to convalesce for a month following childbirth, following a special diet, and observing various taboos to protect the body from exposure to the "wind"
yuè zi
traditional one-month confinement period following childbirth
puerperium
hài yuè zi
morning sickness (in pregnancy)
chū yuè zi
to complete the month of confinement following childbirth
cf 坐月子[zuo4 yue4 zi5]