I like this pattern because it's easy.
I found it here: http://www.etsy.com/listing/61959284/pattern-beginner-baby-booty-skidoo-2?ref=sc_1
I wasn't sure if I would be able to knit these or not but the etsy seller was very patient and helpful as I knit them. -Not that it was a hard pattern but at the time I was new to knitting. I never know when I buy a pattern if I'm just out there on my own trying to figure it out or if I can ask questions along the way.
I've made dozens of these since and have given them to all my expecting friends. They fit for a long time after the sizes listed too and are warm and toasty!
One of my projects this month is to knit more but in red for the base part and white for the cuff even adding some fun fur to the top. Will post up some pictures when I get them done.