Here is the pattern for the shoes. It´s really simple but I hope it can be useful anyway.
I am just posting a photo of the pattern, but put in a 1cm reference mark, so that it should be easier to scale. This size fits my 6 month old.

When sewing the top fabric an lining together i sew along the solid line on the front (with rubberband attached), and THEN cut down the middle and toward the corners. Hope that makes sense (?)
Step 2 is folding the top an lining apart (and iron flat), and then sewing the heel seem.
Step 3 is attaching the sole to the outside fabric and the sole lining to the lining fabric. I leave an opening in the lining for turning.