How to single crochet decrease
There are 2 ways to decrease single crochet. For amigurumi, crocheted stuffed dolls, an invisible decrease is much preferred because it helps keep your piece looking smooth on the outside.
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Step-by-step photos
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1. Insert the hook under the front loops of the next 2 stitches.

2. Yarn over, and pull through the 2 front loops. There should now be 2 loops on your hook.

3. Yarn over, and pull through the 2 loops on the hook.

Here’s what an invisible decrease looks like when followed by a single crochet stitch. Hard to see the invisible decrease, right?
Alternative method: Regular decrease

1. Insert hook under both loops of next stitch, and yarn over.

2. Pull yarn through stitch. There should now be 2 loops on your hook.

3. Insert hook under both loops of next stitch, and yarn over.

4. Pull yarn through stitch. There should now be 3 loops on your hook.

5. Yarn over

6. Pull yarn through all 3 loops, and you’re done! There should only be 1 loop left on your hook.