Any recommended finger stretching methods?

I am trying to get my fingers to occupy a fret each on the same string (E), but I cannot get anywhere near the spread I need, in fact, I can't seem to get much separation in them at all. Fingers 1 and 3 seem to be naturally drawn to finger 2.

Things to note, I have only been playing a few weeks. I understand that all things take practice and time, but is there any methods of finger stretching that will speed up the process?