Roo or pullets? Please help

[RivaJam]

Hi all, I'd like your opinion on whether these are pullets or roos. I'm pretty sure both Welsummers are boys but I'm not 100% of the Wyandotte or the Australorps. I think Australorp 1 is pullet and 2 is roo but this is my first time raising chickens so advice would be great!

Gold laced red wyandotte:




Welsummer 1



Welsummer 2



Australorp 1



Australorp 2

 

[Y N dottes]

my guess is both australorps are pullets, but the rest are roos

 

[K Spot]

The first two birds are roos, but the first isn't a Wyandotte - wrong comb and colour.