Baby Hat Size Help

Hi All! I’m looking for some help with this pattern:

I’d like to make this a bit bigger – maybe a little more like 0-3 months, would i just use larger needles? Also, could I make the brim stretchy enough if I use a long tail cast on over 2 needles instead of one?

Thanks in advance!!

It’s always harder to increase size with a detailed pattern. This could be increased at the stockinette parts, but it may affect the decreases. I think for this one you could probably just use heavier weight yarn like DK. You’ll have to experiment a bit maybe.

The chart on this page shows some head circumferences. It might help with your planning.
http://www.woollywormhead.com/sizing/