I think it's a cockerel - you should be able to tell for sure in a week or two - just watch for the comb to change color or for the wattles to get any bigger.
Like 2 of the other posters, your chick's comb is bigger than my 2 leghorn pullets' combs at 7-8 weeks of age (see picts).

BackYard Chickens › BYC Forum › Chicken Breeds › What Breed Or Gender is This? › 4.5 Week Old White Leghorn - Pullet or Rooster?
4.5 Week Old White Leghorn - Pullet or Rooster? - Page 2
BackYard Chickens › BYC Forum › Chicken Breeds › What Breed Or Gender is This? › 4.5 Week Old White Leghorn - Pullet or Rooster?







But I am not to good at this yet so i will keep my fingers crossed 





