What is permissible for the Imam to do during the prayer
أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا سُفْيَانُ، عَنْ عُثْمَانَ بْنِ أَبِي سُلَيْمَانَ، عَنْ عَامِرِ بْنِ عَبْدِ اللَّهِ بْنِ الزُّبَيْرِ، عَنْ عَمْرِو بْنِ سُلَيْمٍ الزُّرَقِيِّ، عَنْ أَبِي قَتَادَةَ، قَالَ رَأَيْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَؤُمُّ النَّاسَ وَهُوَ حَامِلٌ أُمَامَةَ بِنْتَ أَبِي الْعَاصِ عَلَى عَاتِقِهِ فَإِذَا رَكَعَ وَضَعَهَا وَإِذَا رَفَعَ مِنْ سُجُودِهِ أَعَادَهَا .
It was narrated that Abu Qatadah said: "I saw the Messenger of Allah (ﷺ)leading the people in prayer, carrying Umamah bint Abi Al-As on his shoulder. When he bowed he put her down and when he stood up from prostration he picked her up again."