[1]The preferred time is the 7th day after birth (or earlier/later as feasible).
[2]Know that khitan is one of the five fitrah practices: circumcision, shaving pubes,
trimming mustache, clipping nails, plucking armpit hair. (Bukhari 5891, Muslim 3035)
[P]Female circumcision (khifad) — practiced in some schools, limited cutting only.