It is narrated from Sayyiduna Abu Qatadah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) was praying while carrying his granddaughter Sayyidah Umamah bint Zaynab (may Allah be pleased with her), who was the daughter of Abu al-As bin Rabi'ah. When he (peace and blessings be upon him) prostrated, he would put her down, and when he stood up, he would pick her up.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3421