I cannot get to them, either.
I listened, and forgive me, I cannot be sure. My girls started kinda honking at three weeks. But not all of them did, it took another few weeks. sigh. Such adorable ducklings!
At a guess I'd say 1 and 3 are girls , two could be a male and 4 ??? ,,,, cute little ones !
If you want to be really sure which are girls, Toss a Credit Card in with them ! ;)