Sahih al-Bukhari 1262
Narrated Um 'Atiyya:
We entwined the hair of the dead daughter of the Prophet (ﷺ) into three braids. Waki said that Sufyan 
said, "One braid was entwined in front and the other two were entwined on the sides of the head."
حَدَّثَنَا قَبِيصَةُ، حَدَّثَنَا سُفْيَانُ، عَنْ هِشَامٍ، عَنْ أُمِّ الْهُذَيْلِ، عَنْ أُمِّ عَطِيَّةَ ـ رضى الله عنها ـ قَالَتْ ضَفَرْنَا شَعَرَ بِنْتِ النَّبِيِّ صلى الله عليه وسلم‏.‏ تَعْنِي ثَلاَثَةَ قُرُونٍ‏.‏ وَقَالَ وَكِيعٌ قَالَ سُفْيَانُ نَاصِيَتَهَا وَقَرْنَيْهَا‏.‏