Al-Adab Al-Mufrad #368
Children
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا مُوسَى، قَالَ: أَخْبَرَنَا الرَّبِيعُ بْنُ عَبْدِ اللهِ بْنِ خُطَّافٍ، عَنْ حَفْصٍ، عَنِ الْحَسَنِ قَالَ: إِنِ اسْتَطَعْتَ أَنْ لاَ تَنْظُرَ إِلَى شَعْرِ أَحَدٍ مِنْ أَهْلِكَ، إِلاَّ أَنْ يَكُونَ أَهْلَكَ أَوْ صَبِيَّةً، فَافْعَلْ.
Al-Hasan said, "If you avoid looking at the hair of anyone in your
family except your wife or a little girl, then do so."
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About Al-Adab Al-Mufrad
This hadith is #368 from Al-Adab Al-Mufrad, in the Book of Children.