Buff Orpington 3 weeks old male or female?

[Harvey6]

First time chicken owner here, and I’m starting to think that all three of my Buff Orpington chicks are Roos. They are about 3.5 weeks old currently. The one has a very red comb already and is much larger than the others. Any advice?

 

[ShrekDawg]

First one definite cockerel, second looks like a pullet, third I think is a pullet but unsure on at this point. Could go either way.

 

[LavenderDaFlerf]

Fist cockerel, second probably a pullet, third is probably cockerel. But as said it's a bit early to be for certain.

 

[Australorpfamily]

First one definite cockerel, second looks like a pullet, third I think is a pullet but unsure on at this point. Could go either way.

X2