The Messenger of Allah said: "Part of the Fitrah is rinsing out the mouth, rinsing out the nostrils, using the tooth stick, trimming the mustache, clipping the nails, plucking the armpit hairs, shaving the pubic hairs, washing the joints, washing the private parts and circumcision.'" (Da'if) Another chain with similar wording.
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مِنَ الْفِطْرَةِ الْمَضْمَضَةُ وَالاِسْتِنْشَاقُ وَالسِّوَاكُ وَقَصُّ الشَّارِبِ وَتَقْلِيمُ الأَظْفَارِ وَنَتْفُ الإِبِطِ وَالاِسْتِحْدَادُ وَغَسْلُ الْبَرَاجِمِ وَالاِنْتِضَاحُ وَالاِخْتِتَانُ حَدَّثَنَا جَعْفَرُ بْنُ أَحْمَدَ بْنِ عُمَرَ حَدَّثَنَا عَفَّانُ بْنُ مُسْلِمٍ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ عَنْ عَلِيِّ بْنِ زَيْدٍ مِثْلَهُ