Which preposition to use with parturitions

of Occurrences 6%

Let our discourse also be common to other principles, and to things proceeding from them to that which is last, and let us, beginning from that which is perfectly effable and known to sense, ascend too the ineffable, and establish in silence, as in a port, the parturitions of truth concerning it.

in Occurrences 1%

Such courage, Dobrizhoffer explains further, is admired in a girl because it makes her "prepared to bear the pains of parturition in time."

Which preposition to use with  parturitions