Hadith 543 a - The Book of Mosques and Places of Prayer - Sahih Muslim - صحيح مسلم - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

5. The Book of Mosques and Places of Prayer - كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ

9) Chapter: Permissibility Of Carrying Children In Prayer

Abu Qatadi reported:

I saw the Messenger of Allah (ﷺ) saying the prayer while he was carrying Umama, daughter of Zainab, daughter of the Messenger of Allah (ﷺ). and Abu'l-'As b. al-Rabi'. When he stood up, he took her up and when he prostrated he put her down, Yahya said: Malik replied in the affirmative.

Reference: 543 a
English reference: Book 4, Hadith 1107
In-book reference: Book 5, Hadith 52
Grade: Sahih
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9) باب جَوَازِ حَمْلِ الصِّبْيَانِ فِي الصَّلاَةِ ‏

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ بْنِ قَعْنَبٍ، وَقُتَيْبَةُ بْنُ سَعِيدٍ، قَالاَ حَدَّثَنَا مَالِكٌ، عَنْ عَامِرِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، ح وَحَدَّثَنَا يَحْيَى بْنُ يَحْيَى، قَالَ قُلْتُ لِمَالِكٍ حَدَّثَكَ عَامِرُ بْنُ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، عَنْ عَمْرِو بْنِ سُلَيْمٍ الزُّرَقِيِّ، عَنْ أَبِي قَتَادَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يُصَلِّي وَهُوَ حَامِلٌ أُمَامَةَ بِنْتَ زَيْنَبَ بِنْتِ رَسُولِ اللَّهِ صلى الله عليه وسلم وَلأَبِي الْعَاصِ بْنِ الرَّبِيعِ فَإِذَا قَامَ حَمَلَهَا وَإِذَا سَجَدَ وَضَعَهَا قَالَ يَحْيَى قَالَ مَالِكٌ نَعَمْ ‏.‏