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!!!

You just start knitting with a new ball of yarn. Hold the tail from the new ball in place for the first couple of stitches and then continue knitting. When you’re finished you can go back and snug up the yarn to neaten that first stitch and then the new tail can be woven into the back of the sweater and the end cut.