I too can't see well enough in the photos to decide. We are looking for signs of saddle feathers.
At 4 months (16 weeks), that should be a rooster with the comb shape and color and crowing, but the feathers and tail are not particularly rooster-ish. I do see a darker red pattern over the wings that gives me indication this is a rooster.
It is very rare to have a hen that crows. Crowing hens are usually older (henopausal) alpha girls who have lost their female hormones as they age such that the androgens are out of balance promoting masculine deepening of their voice.
Male saddle feathers often don't appear until 5 to 6 months of age. So if you are really hearing crowing, it is far, far more likely you have a developing rooster who apparently is a very sweet guy....so sweet in fact, that if you can keep him, do. He'll make fine tempered babes. Good roosters will tend to younger chicks and lovingly watch over their girls. (My Barnevelder is such a one).
But give us a better photo. It would confirm what those feathers are doing.
LofMc
