Hadith 6:305
Ghundar narrated to us, from Uthman, who said: I asked al-Hasan about a slave girl if she dies, should she be covered [with a headscarf] even if she has not reached puberty? He said: No, but she is to be shrouded in three garments.
حدثنا غندر عن عثمان قال سألت الحسن عن الجارية إذا ماتت هل تخمر ولم تحض قال لا ولكن تكفن في ثلاثة أثواب