Normally you have to wait a little before you can sex them since you are looking mainly for barring (depending on the variety). Some people say that the male chicks are lighter and female chicks are darker I think...For me I just wait for when they are a little older. For white peafowl it takes much longer.
Bird # 2 is a hen and bird # 3 is another male. At this age it is easily discernible by the differences in the pattern on their chest/breast feathers. Hens will have a scalloped appearance dark in the center with a light colored edge males will have an almost polka dotted appearance.