Cockerel or pullet?

[Esme2345]

Hello, I have recently hatched 3 chicks and they’re now just under 4 weeks old. I’m still not sure on their genders, one of them is much bigger than the others, the grey one, but the comb on my other chicken, the cream one, has recently started to go a bit pinkish. Also how do rooster and pullet chicks behave differently at this age? Im new to all this so any help would be very appreciated. I’ll attach some pictures, thank you

 

[Esme2345]

 

[chrissynemetz]

The comb on the white one makes me suspect it's a cockerel, but they're still pretty young to tell for sure yet. Can you post more pictures in a few weeks?

 

[esme13]

Your white one is likely a rooster at 4 weeks with the large comb and deeper coloration to it. Behavior of rooster chicks tend to be much more alert and hold their bodies high. But I have seen pullets behave that way too. Can you post more pictures and of the breeds.