Teddy Bear sweater

I am starting the front of a Teddy Bears sweater. Pattern says cast on 22 sts and rib (k1,p1) for 6 rows followed by:
st o st 12 rows (which is the part I don’t understand?)
Does the o mean yarn over.
How would I work those 12 rows? Please be specific. Thankyou for the help. I want to finish it for a little girls birthday.

It could be stockinette stitch (st st) for 12 rows but it would help to see the pattern or a photo. Can you give us the pattern name or a link to it?