she gave birth to Muhammad bin Abi Bakr As-Siddiq in Al-Baida, Abu Bakr told the Messenger of Allah about that, and he said: "Tell her to perform Gusl then begin the Talbiyah.'' (Using translation from Nasāʾī 2663)  

أَنَّهَا وَلَدَتْ مُحَمَّدَ بْنَ أَبِي بَكْرٍ بِالْبَيْدَاءِ فَذَكَرَ أَبُو بَكْرٍ ذَلِكَ لِرَسُولِ اللهِ ﷺ فَقَالَ «مُرْهَا فَلْتَغْتَسِلْ ثُمَّ لِتُهَلَّ»  

That he went out for Hajj with the Messenger of Allah on the Farewell Pilgrimage, and his wife Asma' bint 'Umais Al-Khath'amiyyah was with him. When they were at Dhul-Hulaifah, Asma gave birth to Muhammad bin abi Bakr. Abu Bakr. Came to the Prophet and told him, and the Messenger of Allah told him to tell her to perform Ghusl, then begin the Talbniyah for Hajj, and to do everything that the people do, except that she should not circumambulate the House.(sahih) (Using translation from Nasāʾī 2664)  

أَنَّهُ خَرَجَ حَاجًّا مَعَ رَسُولِ اللهِ ﷺ حَجَّةَ الْوَدَاعِ وَمَعَهُ امْرَأَتُهُ أَسْمَاءُ بِنْتُ عُمَيْسٍ الْخَثْعَمِيَّةُ فَلَمَّا كَانُوا بِذِي الْحُلَيْفَةِ وَلَدَتْ أَسْمَاءُ مُحَمَّدَ بْنَ أَبِي بَكْرٍ فَأَتَى أَبُو بَكْرٍ النَّبِيَّ ﷺ فَأَخْبَرَهُ فَأَمَرَهُ رَسُولُ اللهِ ﷺ أَنْ يَأْمُرَهَا «أَنْ تَغْتَسِلَ ثُمَّ تُهِلَّ بِالْحَجِّ وَتَصْنَعَ مَا يَصْنَعُ النَّاسُ إِلَّا أَنَّهَا لَا تَطُوفُ بِالْبَيْتِ»