Is there a rule of thumb for this ?

[vaknitter]

I am working a baby blanket with Bernat Softee Baby ... the label says to knit on a size 6. I am going to double the yarn to make a slightly thicker fabric. I knit a swatch on size 10 and size 9 and feel like the size 10 needle makes the fabric a little too loose for a baby so I am started on the 9's...now I am having second thoughts.

Is there a rule of thumb on how to guage what size needles to use when doubling yarn ?

[Ingrid]

No, there's no set rule. What you did is what is suggested--try different needles until you get the fabric you want.

[ArtLady1981]

You did just right!