The size shown is 6-12 months. I used about one and a third skeins of Cascade's Venezia worsted (@315yds total) with a #8 16" circular needle. I used that needle for the whole sweater and added a second 12" #8 for the sleeves instead of DPN's.
The gauge: 5sts=1" although the gauge isn't super important on this one. Generally I've found that most people tend to make this a little on the big side, which for yourself you might not want but for the little ones a little bigger never hurts.
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