How to Reattach yarn without a tail
I am knitting a baby sweater and am working on the front. Once towards the top, the pattern had me split the stitches with four stitches cast off in the middle. Then I placed half on a stitch holder and worked the other half to the completed length. Now, I need to go back to the other stitches that are on a holder and work those to the end. How do I reattach the yarn when there is not tail? HELP!!!