I am starting to knit a cardigan for my sisters baby. It's from a Sirdar pattern.
In Row 3 of the Left Front section it says to
"Rib and Slip seven stitchs onto a stitch holder, rib to end inc 1 stitch in the centre of the row for 1st 2nd 4th and 6th sizes only. 17 [19 22 25 28 31 34] sts."
I understand Rib, but I don't know how to 'rib and slip', and I am unsure if I should be increasing one stitch in the middle of the row as the size I am knitting has 22 so I do not know if 1st, 2nd 3rd etc includes the 17 outside the brackets.
I hope that this makes sense to someone as I am a bit lost.
I'd appreciate some help!!