The Messenger of Allah (ﷺ) was leading the people in prayer with Umamah daughter of Zainab daughter of the Messenger of Allah(ﷺ) (in his lap). When he prostrated, he put her down and when he got up(after prostration) he lifted her up.
Sunan Abi Dawud Book 2, Hadith 528
← Previous Hadith The iqamah for the morning prayer was pronounced and the Messenger of Allah (ﷺ) began to offer prayer while he was looking at the mountain-pass.

(AbuDawud elaborated that the Prophet had sent a horseman to the mountain-pass at night in order to keep watch.)

Sunan Abi Dawud Book 2, Hadith 527 Next Hadith → We were sitting in the mosque when the Messenger of Allah (ﷺ) came upon us carrying Umamah daughter of Abul'As ibn ar-Rabi'. Her mother was Zaynab daughter of the Messenger of Allah (ﷺ). She (Umamah) was a child and he (the Prophet) was carrying her on his shoulder.

The Messenger of Allah (ﷺ) led (the people) in prayer while she was on his shoulder. When he bowed he put her down and took her up when he got up. He kept on doing so until he finished his prayer.

Sunan Abi Dawud Book 2, Hadith 529