Bulugh al-Maram, Book 3, Hadith 27 (In-Book)

Samurah bin Jundub (RAA) narrated, ‘I offered the funeral prayer behind the Prophet for a woman who had died during child-birth and he (prayed) standing opposite the middle of her body.' Agreed upon.

وَعَنْ سَمُرَةَ بْنِ جُنْدُبٍ ‏- رضى الله عنه ‏- قَالَ: { صَلَّيْتُ وَرَاءَ اَلنَّبِيِّ ‏- صلى الله عليه وسلم ‏-عَلَى امْرَأَةٍ مَاتَتْ فِي نِفَاسِهَا, فَقَامَ وَسْطَهَا } مُتَّفَقٌ عَلَيْهِ 1‏.‏ ‏1 ‏- صحيح.‏ رواه البخاري (3/201/فتح)‏، ومسلم (964)‏.‏

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also referenced under: Book 3, Hadith 583 (English)