Is the chest swollen or is his crop just full, once my birds gourged themselves on watermelon and I thought their crops would explode I think I posted here actually lol. Anyway at this age unless they're standing and unless they have obvious rooster signs it's very hard to tell gender. Easter eggers are very tough in my opinion to tell... But all of mine have ended up being female, I've accumulated 11 I think and I've noticed they're all pretty confident and between 4-6 months start laying and then it's pretty obvious. Let's see... The light brahma is a slower developing breed than some so it's a little tough to tell with them too, they're massive chicks in my opinion. My light brahma is broody right now much to my delight, we are going to put her on some eggs today. I think your Sussex is a pullet just because I have a while coop of them and they're all hens and this bird looks just like they did at that age and I feel like the roosters might be showing some reddening of the comb already but that's just in my head I think- another slow growing breed. The barred rocks the makes have wider white between the black in most cases but I only have two so no an expert... Though I have lots of Dominique's and the barring follows the same rules. I've never kept australorps but it's still so early... I'm going to guess these are all pullets though keep a special eye on that ee and watch their behaviour more than anything at this age. You'll know for sure soon!
1. Barred rock xia 
