It is narrated from Sayyidah Umm Salamah (may Allah be pleased with her) that Sayyidah Subay'ah al-Aslamiyyah (may Allah be pleased with her) gave birth twenty days after the death of her husband, and the Prophet (peace and blessings be upon him) ordered her to marry.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19840