It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to pray while Umamah bint Abi al-As was on his (peace and blessings be upon him) shoulder. When he bowed, he would put her down, and when he stood, he would pick her up.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19275