I have made 1 and started the second baby sock, and I used the “trading places” joining method, since just doing the first stitch tight made a little dip in the top. You swap the first stitches between the two end needles.
My problem is that then the working yarn is between two stitches, and the first stitch is sort of weird. Am I doing this wrong? Are there other ways of joining the 1st round?