It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) would pray while Umamah bint Zaynab bint al-Nabi (peace and blessings be upon him), who was the daughter of Abu al-As bin al-Rabi' bin Abd al-Uzza, was on his (peace and blessings be upon him) shoulder. When he (peace and blessings be upon him) bowed, he would put her down (on the ground), and when he rose from prostration, he would pick her up and put her back on his shoulder.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19269