Language:
كتاب الجنائز
23  
Funerals (Al-Janaa'iz)
(62)
Chapter: The offering of the funeral Salat of a woman who died during the delivery (of a child)
(62)
باب الصَّلاَةِ عَلَى النُّفَسَاءِ إِذَا مَاتَتْ فِي نِفَاسِهَا
Sahih al-Bukhari 1331

Narrated Samura bin Jundab:

I offered the funeral prayer behind the Prophet (ﷺ) for a woman who had died during childbirth and he stood up by the middle of the coffin.

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا حُسَيْنٌ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ بُرَيْدَةَ، عَنْ سَمُرَةَ ـ رضى الله عنه ـ قَالَ صَلَّيْتُ وَرَاءَ النَّبِيِّ صلى الله عليه وسلم عَلَى امْرَأَةٍ مَاتَتْ فِي نِفَاسِهَا، فَقَامَ عَلَيْهَا وَسَطَهَا‏.‏
Reference : Sahih al-Bukhari 1331
In-book reference : Book 23, Hadith 86
USC-MSA web (English) reference : Vol. 2, Book 23, Hadith 415
  (deprecated numbering scheme)