Umaamah bint Abee al-'Aas was on his صلى الله عليه و سلم shoulder...

On the authority of Abee Qataadah who said: "The Messenger of Allaah صلى الله عليه و سلم came to us while Umaamah bint Abee al-'Aas was on his shoulder. Then, he prayed. When he bowed, he would put her down, and when he rose up from bowing he would pick her up." [Saheeh Bukhaaree]