Umm ‘Atiyyah al-Ansariyyah (may Allah be pleased with her) said: We braided the hair of the daughter of the Messenger of Allah ﷺ, making three plaits—one with the hair at the front and two with the hair on either side—and then placed them behind her.
Hadith Referenceمسند الإمام الشافعي / كتاب الجنائز / 559
Hadith Takhrijاخرجه البخاري، الجنائز، باب يلقى شعر المرأة خلفها (1263) ۔ مسلم ، الجنائز، باب غسل الميت (939)۔