הלכה על ויקרא 12:5

The commandment of the matter of the impurity of a woman who has given birth: To render a woman who has given birth impure; meaning to say that when a woman gives birth she be impure for her husband - and all the more so for pure items - seven days for a male and two weeks for a female, as it is stated (Leviticus 12:2, Leviticus 12:5), "If a woman conceives and gives birth to a male, she will be impure for seven days, etc. And if she gives birth to a female, she will be impure for two weeks, etc."