Sunan Ibn Majah
648
Hasan Sahih+3

It was narrated that Umm Salamah said:"At the time of the Messenger of Allah, women in postnatal bleeding (after childbirth) used to wait for forty days, and we used to put Wars on our faces because of freckles

Hasan SahihAl-Albani
Hasan SahihMuhammad Fouad Abd al-Baqi