I don't remember the exact pattern but see my earlier post, #23. The baby cable rib part is just a variation of a 2x2 rib. When knit in the round, the cable happens every 4th row. If knitting end to end as for a scarf, it happens on the 5th row so it will be on the right side of the work. On this cable row, you knit the knit stitches K2 together without pulling them off the needle. Then reinsert the right needle between those two stitches, knit the right stitch, then pull them both off, creating a little twist. The next two stitches on the left needle will be ready to work as purls.
Socks, Mountain Colors Bearfoot in "Sweet Pea" colorway.