The Prophet ﷺ married me when I was a girl of six. We then arrived in Medina and stayed with Banu Harith bin Khazraj. I fell ill with a fever, and my hair fell out, then later grew back thick down to my shoulders.My mother Umm Ruman came to me while I was on a swing with some of my friends. She called out to me, and I went to her, not knowing what she wanted. She took me by the hand and brought me to stand at the door of the house. I was panting until my breath calmed down. Then she took some water and wiped my face and head with it, and brought me into the house. There were women of the Ansar inside, who said, "Upon goodness and blessing, and upon the best of fortune."She handed me over to them, and they prepared me. Nothing startled me except the arrival of the Messenger of Allah ﷺ in the forenoon. They handed me over to him, and I was at that time a girl of nine.
تزوجني النبي ﷺ وأنا بنت ست سنين، فقدمنا المدينة، فنزلنا في بني الحارث بن خزرج، فوعكت، فتمرق شعري، فوفى جميمة، فأتتني أمي أم رومان،- وإني لفي أرجوحة ومعي صواحب لي-، فصرخت بي، فأتيتها، لا أدري ما تريد بي؟ فأخذت بيدي حتى بيدي حتى أوقفتني على باب الدار، وإني لأنهج حتى سكن بعض نفسي، ثم أخذت شيئا من ماء فمسحت به وجهي ورأسي، ثم أدخلتني الدار، فإذا نسوة من الأنصار في البيت، فقلن: على الخير والبركة، وعلى خير طائر، فأسلمتني إليهن، فأصلحن من شأني، فلم يرعني إلا رسول الله ﷺ ضحى، فأسلمنني إليه وأنا يومئذ بنت تسع سنين.
Bukhari related it in "Virtues" (3894), and Muslim in "Marriage" (1422:69), both through Hisham bin Urwa, from his father, from Ayesha, who narrated it. The wording given here is Bukhari's.