It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) came out for the prayer while he (peace and blessings be upon him) was carrying on his shoulder Umamah bint Abi al-As bin al-Rabi', whose mother was Sayyidah Zaynab, the daughter of the Messenger of Allah (peace and blessings be upon him). When he (peace and blessings be upon him) bowed, he would take her down from his shoulder, and when he finished his prostration, he would lift her onto his shoulder again. He kept doing this continuously until he finished the prayer.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19273