It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) would come out carrying the daughter of Zaynab on his (peace and blessings be upon him) shoulder, and he would lead the people in prayer. When he stood, he would pick her up, and when he bowed, he would put her down.
Hadith Referenceالمعجم الكبير للطبراني / مسند النساء / 19274