That looks swollen for sure. My guess is it's edema, or extra fluid in the tissues of his head and in his eyelids. That "extra" eye lid is just swollen membranes from the extra fluid. When I've had patients get lots of edema or IV fluids I see "extra" looking membranes in their eyes that go down when the extra fluid is expelled.
As far as it being something wrong to cause the edema, maybe it was the position within the egg, and circulation wasn't so hot those last few days cramped up in there, thus fluids pooled in the head. If it's not "something wrong" but just positioning, the fluid will regulate into the rest of the body now that he's out and not so cramped up.