The LORD spoke to Moses, saying,
The law here pronounces women lying-in ceremonially unclean. The Jews say, "The law extended even to an abortion, if the child was so formed as that the sex was distinguishable." 1. There was some time of strict separation immediately after the birth, which continued seven days for a son and fourteen for a daughter, Lev 12:2, Lev 12:5.
Commenting on Leviticus 12:1-5
And the Lord spake unto Moses,.... The laws in the preceding chapter were delivered both to Moses and Aaron, but what follows in this only to Moses; but inasmuch as the priest had a concern in it, it being his business to offer the sacrifices required by the following law, it was no doubt given to Moses, to be delivered to Aaron, as well as to the people. R.
Lev 12:1-2 Uncleanness and Purification after Child-Birth. - Lev 12:2-4. “If a woman bring forth (תּזריע) seed and bear a boy, she shall be unclean seven days as in the days of the uncleanness of her (monthly) sickness.” נדּה, from נדד to flow, lit., that which is to flow, is applied more especially to the uncleanness of a woman’s secretions (Lev 15:19). דּותהּ, inf.
Commenting on Leviticus 12:1-2