By far the most popular weight yarn, according to yarn manufacturers Lion Brand and Bernat, is worsted weight yarn.
One-Stitch Baby Knits & Worsted Baby Yarn Pack
Worsted Weight Yarn for Crocheting – Comprehensive Guide and Where to Buy — Pocket Yarnlings — Pocket Yarnlings
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How to Hold Multiple Strands to make a New Heavier Weight Yarn > Fay D – Provenance Craft Co
Guide to Worsted Weight Yarn - Sarah Maker