Possibly the hat that he'll wear home from the hospital.
I'm using the same yarn I used for the trim on his striped Baby Vertebrae sweater.
I'm going to crack out some booties as well!
The name of the pattern is 'Cable Baby' and is a free download on Ravelry.
It's ridiculously easy, and if you are still on the fence about knitting with cables this hat will help you clear that fence like and Olympic hurtler!
It says to use a circular needle but I find with baby hats that DPN's work much better, or if you prefer magic loop that should work as well.
I need to get hustling on this though, I think the betting pool is leaning towards an early arrival for BW who is technically supposed to be here end of October.
I seriously can't wait to meet him. Not to mention see him all whooled (who-ooled) up in knitwear!