Circumcision and hygiene:

If you have a foreskin, you retract it and wash under it, end of story.

Using soap is fine, you just need to be sure that all of it is washed away before rolling the foreskin forward - otherwise some will tend to be pushed into the urethra which is painful.

The foreskin doesn't have any magical properties that make it dirty more easily than say, an armpit. It is actually quite a bit LESS prone to smelling than either armpits or ball sack.

If you're an uncut male who doesn't shower for a period of time, you begin smelling from everywhere BUT the penis.

> What about babies?

A baby's foreskin is attached to the penis head (like glue). That keeps out all foreign matter (like diaper shit). As a parent, you have absolutely nothing to do. Some doctors may suggest forcibly retracting it, this is a terrible idea for reasons that should be obvious.

Some time around 6-8 years old, it will naturally detach. At this point your boy should already be able to at least partially wash himself, and you only have to instruct him to try to pull it back - if it hurts, that means it's not detached yet and he should try again later. Once he is able to do retract it, he can then begin washing it. Once he realizes it is pleasurable, there will never again be a concern for hygiene.

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If you are dogmatically opposed to masturbation, this is one of few cases where circumcision actually serves a purpose. Firstly, there is never any need for your son to wash his penis so he can pretend it doesn't exist. Secondly, when he does discover masturbation, it is somewhat harder to do without a foreskin.