Why only males have the covenant with YHWH, no females?

if you was to read the book of Genesis, when YHWH('the [true] God') tells Abram, later called Abraham, that he has to be circised, and all the males must be circised, as it being the covenant between 'God' and Man. for the male that means the removing of the Prepuce(foreskin), as with females, they would have their Prepuce, oris, and Labium, or Labia which being plural. so why is it that 'God' said that only the males are to be circised, he didn't say a thing about the females. are they not suppose to be?