the only info we got on Others being made is from Craster's sons being converted, so that explains the male white walkers but what about the females
the night king loved a female walker, so we know at least one existed...
Ah, but I have a theory that they are not truly Others, only Otherized (or live-wighted) humans. They are between the worlds, just like Night's King. Sad, isn't it?
I think the Other women are at home doing the laundry and such female tasks. Someone has to make things comfortable for the menfolk. They're tired when they get back from rangings and need a place to get away from all the pressures of keeping watch for signs of encroaching humans.