'Menstruation' in the Bible

“Speak to the sons of Israel, saying:‘When a woman gives birth and bears a male child, then she shall be unclean for seven days, as in the days of her menstruation she shall be unclean.

But if she bears a female child, then she shall be unclean for two weeks, as in her menstruation; and she shall remain in the blood of her purification for sixty-six days.

Any bed on which she lies all the days of her discharge shall be to her like her bed at menstruation; and every thing on which she sits shall be unclean, like her uncleanness at that time.