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Then I would think Welsummer as well, because there should be some white showing in that bird's earlobes by this age.

Do you see any color yet on it's earlobe? Welsummers will have red ears, and leghorns will have white. It's a bit hard to tell from that photo what you have. A body profile shot might help. Leghorns are a lot thinner, and Welsummers have more muscle.