It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her); she said: The husband of Subay'ah bint al-Harith died, and a few days after his death she gave birth, and the Prophet (peace and blessings be upon him) ordered her to marry.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19860