Could you post a few photos of some you think are boys and some that you are pretty sure are girls. What we need are shots of the head showing comb and wattles. A view showing general posture, legs, and tail can be very helpful. Five months may be too early for saddle and hackle feathers to...
This thread has photos to show you what to look for to see if the eggs are fertile. If you see the bull’s eye instead of the dot, he is mating the hens.
Fertile Egg Photos
https://www.backyardchickens.com/t/16008/how-to-tell-a-fertile-vs-infertile-egg-pictures
The hen’s genetics control what...
The chicken mating ritual
The rooster dances – this shows his interest.
The hen squats – this gets her body on the ground so the weight of the rooster goes through her body, not just her legs. This way the rooster can be quite a bit larger than the hen without his weight injuring her legs...