Subai'a Al-Aslamiya gave birth to a child a few days after the death of her husband. She came to the Prophet and asked permission to remarry, and the Prophet ﷺ gave her permission, and she got married. (Using translation from Bukhārī 5320)  

أَنَّ سُبَيْعَةَ الْأَسْلَمِيَّةَ نُفِسَتْ بَعْدَ وَفَاةِ زَوْجِهَا بِلَيَالٍ فَجَاءَتْ رَسُولَ اللهِ ﷺ «فَاسْتَأْذَنَتْهُ أَنْ تَنْكِحَ فَأَذِنَ لَهَا فَنَكَحَتْ»  

the Prophet ﷺ told Subai'ah to get married, when her postnatal bleeding ended. (Using translation from Ibn Mājah 2029)  

أَنَّ النَّبِيَّ ﷺ «أَمَرَ سُبَيْعَةَ أَنْ تَنْكِحَ إِذَا تَعَلَّتْ مِنْ نِفَاسِهَا»  

"Subai'ah gave birth twenty-three or twenty-five days after her husband died, and when her Nifas ended she expressed her wish to remarry and was criticized for that. Mention of that was made to the Messenger of Allah and he said: 'There is nothing to stop her; her term has ended.'" (Using translation from Nasāʾī 3508)  

وَضَعَتْ سُبَيْعَةُ حَمْلَهَا بَعْدَ وَفَاةِ زَوْجِهَا بِثَلَاثَةٍ وَعِشْرِينَ أَوْ خَمْسَةٍ وَعِشْرِينَ لَيْلَةً فَلَمَّا تَعَلَّتْ تَشَوَّقَتْ لِلْأَزْوَاجِ فَعِيبَ ذَلِكَ عَلَيْهَا فَذُكِرَ ذَلِكَ لِرَسُولِ اللهِ ﷺ فَقَالَ «مَا يَمْنَعُهَا قَدِ انْقَضَى أَجَلُهَا»  

"Abu Hurairah and Ibn 'Abbas differed concerning the widow who gives birth after her husband's death. Abu Hurairah said: 'She may be married.' Ibn 'Abbas said: '(She has to wait) for the longer of the two periods.' They sent word to Umm Salamah and she said: 'The husband of Subai'ah died and she gave birth fifteen days -half a month- after her husband died.' She said: 'Two men proposed marriage to her, and she was inclined toward one of them. When they feared that she was becoming single-minded (on this issue, and not consulting her family), they said: It is not permissible for you to marry. She went to the Messenger of Allah and he said: 'It is permissible for you to marry, so marry whomever you want.''" (Using translation from Nasāʾī 3509)  

سَمِعْتُ أَبَا سَلَمَةَ يَقُولُ اخْتَلَفَ أَبُو هُرَيْرَةَ وَابْنُ عَبَّاسٍ فِي الْمُتَوَفَّى عَنْهَا زَوْجُهَا إِذَا وَضَعَتْ حَمْلَهَا قَالَ أَبُو هُرَيْرَةَ تَزَوَّجُ وَقَالَ ابْنُ عَبَّاسٍ أَبْعَدَ الْأَجَلَيْنِ فَبَعَثُوا إِلَى أُمِّ سَلَمَةَ فَقَالَتْ تُوُفِّيَ زَوْجُ سُبَيْعَةَ فَوَلَدَتْ بَعْدَ وَفَاةِ زَوْجِهَا بِخَمْسَةَ عَشَرَ نِصْفِ شَهْرٍ قَالَتْ فَخَطَبَهَا رَجُلَانِ فَحَطَّتْ بِنَفْسِهَا إِلَى أَحَدِهِمَا فَلَمَّا خَشُوا أَنْ تَفْتَاتَ بِنَفْسِهَا قَالُوا إِنَّكِ لَا تَحِلِّينَ قَالَتْ فَانْطَلَقَتْ إِلَى رَسُولِ اللهِ ﷺ فَقَالَ «قَدْ حَلَلْتِ فَانْكِحِي مَنْ شِئْتِ»  

"Ibn 'Abbas and Abu Hurairah were asked about the woman whose husband dies when she is pregnant. Ibn 'Abbas said: '(She should wait) for the longer of the two periods.' Abu Hurairah said: 'When she gives birth it becomes permissible for her to marry.' Abu Salamah went to Umm Salamah and asked her about that, and she said: 'Subai'ah Al-Aslamiyyah gave birth half a month after her husband died, and two men proposed to her. One was young and one was old, and she was inclined toward the young one. So the old one said: It is not permissible for you to marry. Her family was not there, and he hoped that if he went to her family they would marry her to him. She went to the Messenger of Allah and he said: It is permissible for you to marry, so marry whomever you want.'" (Using translation from Nasāʾī 3510)  

وَقَالَ أَبُو هُرَيْرَةَ إِذَا وَلَدَتْ فَقَدْ حَلَّتْ فَدَخَلَ أَبُو سَلَمَةَ عَلَى أُمِّ سَلَمَةَ فَسَأَلَهَا عَنْ ذَلِكَ فَقَالَتْ وَلَدَتْ سُبَيْعَةُ الْأَسْلَمِيَّةُ بَعْدَ وَفَاةِ زَوْجِهَا بِنِصْفِ شَهْرٍ فَخَطَبَهَا رَجُلَانِ أَحَدُهُمَا شَابٌّ وَالْآخَرُ كَهْلٌ فَخُطِبَتْ إِلَى الشَّابِّ فَقَالَ الْكَهْلُ لَمْ تَحْلُلْ وَكَانَ أَهْلُهَا غُيَّبًا فَرَجًا إِذَا جَاءَ أَهْلُهَا أَنْ يُؤْثِرُوهُ بِهَا فَجَاءَتْ رَسُولَ اللهِ ﷺ فَقَالَ «قَدْ حَلَلْتِ فَانْكِحِي مَنْ شِئْتِ»