Chicken gender, help! - Page 2
Agree, first one definite cockerel. Second is toying with going over to the cockerel side - a couple more weeks should tell!
Bearing in mind that those are wyandottes with rose combs (so it's not like they have a large single comb) that much pronounced redness in the comb at that age is screaming cockerel. Size of chick is irrelevant in my opinion. As stated by someone else, at that age pullets will have a yellow, solid looking comb which usually starts to turn pink and go fleshy about 15-16 weeks and turns red just before they start to lay. Anything that has a pink fleshy comb at this age will probably develop into a roo. Your second chick has some pinkness, so although it's not as obvious as the first one, it's definitely a maybe.