The slip stitch is a special stitch all on its own. It doesn’t have a height like most stitches, as it’s most commonly used for joining rounds, especially in amigurumi.
The slip stitch is used to join a length of chain into the round. Insert the hook from front to back into the first chain you worked. Wrap yarn round the hook (yrh) in an anticlockwise direction.
Pull the yarn through the chain stitch (as shown) and then the loop already on the hook to make a slip stitch. You can also work this stitch into each stitch along a row to form a neat edging.