Welsummer for sure.....did you order these from a hatchery or a breeder?
I know nothing of hatchery birds so I will speak only from my experience with breeding and raising Welsummers, I'm inclined to say and would need a couple more photos before I commit, but this chick by markings looks to be a boy
Can you get a picture of the back of this chicks head and down the back and also a photo of the chicks "eye-liner" ?