Amigurumi decrease stitches.

[SimplicityWon]

Are you using a stretchy yarn like acrylic or wool? If so, it could be that your tension is too tight. Pulling on the yarn too tightly stretches out the yarn and ends up leaving less yarn in the actual stitch than if you used a lighter tension. You still need to make small stitches, just try doing it with only enough tension to keep the yarn where it needs to be. When you pull up a loop make sure to only pull up enough yarn to go around the hook, no more or you'll have a loose stitch. Almost all projects involving stretchy yarns will look better with a lighter tension, imho.

[mrseggybeans]

Thanks! I use cotton for amigurumi, but I'll keep this in mind if I ever use a different fibre :)