This is the one that is so very delicate and depends on genetics and individual development a lot.

Lack of prepuce motility can also lead to phimosis. And lack of hygiene can also make the foreskin a locus of infection. It is not like a vagina that can stay clean and discharges on their own. Any debris or substance that lodges under the prepuce can cause infection so you do have to keep it clean. This is particularly problematic with diaper use that concentrates humidity for too long in genital area. Also, some kids make it to puberty with a fused prepuce and have to have it manually and painfully mechanically separated. While gentle normal washing rub during showers usually helps with the gradual and natural separation.

Like a lot of things in human health, it's not that black and white. Fuck circumsicion for aesthetic reasons though, that's genital mutilation, amounts to child abuse and I have seen too many families lose babies to circumcision related complications.