Five practices are part of the natural disposition: trimming the nails, shortening the moustache, plucking the underarm hair, shaving the pubic hair, and circumcision.
أخبرنا قتيبة عن مالك عن المقبري
خمس من الفطرة تقليم الأظفار وقص الشارب ونتف الإبط وحلق العانة والختان
[Sahih, stopped] It is in Kubra, no. 9289. It is also in Muwatta (narration of Yahya), 2/921, from Saeed bin Abu Saeed Maqburi, from his father, from Abu Hurairah, stopped, in similar wording. Bishr bin Amr made it a raised report (Tamhid, 21/56), and he is trustworthy, so the hadith is sahih. He is trustworthy, so the hadith is sahih both as a stopped report and as a raised report.