Yahya related to me from Malik from Yahya ibn Said from Sulayman ibn Yasar that Abdullah ibn Abbas and Abu Salama ibn Abd ar-Rahman ibn Awf differed on the question of a wornan who gave birth a few nights after the death of her husband. Abu Salama said, "When she gives birth to the child she is carrying, she is free to marry." Ibn Abbas said, "At the end of two periods." Abu Hurayra came and said, "I am with my nephew", meaning Abu Salama. They sent Kurayb, a mawla of Abdullah ibn Abbas to Umm Salama, the wife of the Prophet ﷺ to ask her about it. He came back and told them that she had said that Subaya al-Aslamiya had given birth a few nights after the death of her husband, and she had brought the matter to the Messenger of Allah ﷺ and he had said, "You are free to marry, so marry whomever you wish."
Malik said, "This is how the people of knowledge here continue to act."
29.31 Widows Remaining in Their Houses until Free to Marry

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سُلَيْمَانَ بْنِ يَسَارٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عَبَّاسٍ، وَأَبَا، سَلَمَةَ بْنَ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ اخْتَلَفَا فِي الْمَرْأَةِ تُنْفَسُ بَعْدَ وَفَاةِ زَوْجِهَا بِلَيَالٍ فَقَالَ أَبُو سَلَمَةَ إِذَا وَضَعَتْ مَا فِي بَطْنِهَا فَقَدْ حَلَّتْ . وَقَالَ ابْنُ عَبَّاسٍ آخِرَ الأَجَلَيْنِ . فَجَاءَ أَبُو هُرَيْرَةَ فَقَالَ أَنَا مَعَ ابْنِ أَخِي . يَعْنِي أَبَا سَلَمَةَ فَبَعَثُوا كُرَيْبًا مَوْلَى عَبْدِ اللَّهِ بْنِ عَبَّاسٍ إِلَى أُمِّ سَلَمَةَ زَوْجِ النَّبِيِّ ﷺ يَسْأَلُهَا عَنْ ذَلِكَ فَجَاءَهُمْ فَأَخْبَرَهُمْ أَنَّهَا قَالَتْ وَلَدَتْ سُبَيْعَةُ الأَسْلَمِيَّةُ بَعْدَ وَفَاةِ زَوْجِهَا بِلَيَالٍ فَذَكَرَتْ ذَلِكَ لِرَسُولِ اللَّهِ ﷺ فَقَالَ " قَدْ حَلَلْتِ فَانْكِحِي مَنْ شِئْتِ " .