Adam Clarke on Leviticus 12:2

If a woman have conceived - In the extent mentioned here the ordinances of this chapter have little relation to us: and to inquire into their physical reasons, as far as they related to the Jews, could afford but little edification; and to make such a subject sufficiently plain would require such minute examination and circumstantial detail as could scarcely be proper for several readers. All that is necessary to be said the reader will find on Lev 12:4.