Yarn Weight - 3-Light. Light Yarn includes the following yarn types: DK, Light Worsted. DK weight yarns are very prevalent in baby yarn projects but can also be used for other knit and crochet projects. The stitches will be smaller than the stitch size you will get using a worsted weight yarn. Patterns take longer to knit using a light, dk weight yarn as the yarn is more thin than worsted weight for example.