From the pattern page:
“This basket-weave knit baby sweater is appropriate for a boy or girl. The textured knit looks best in solid colors. My personal favorite is yellow or off-white.

“An intermediate level project. Supplies: 1 ball Bernat Softee Baby, US size 2 and 4 straight needles, size 2 and 4 dpn’s, 5 stitch holders (one 6-inch, 4 small), crochet hook, 5 ½-inch buttons.

“Gauge: 22 rows = 2”, 13 st = 2” approx. Finished size: 10” across chest, buttoned, 10½” long, collar-to-cuff about 10” If you want a sweater about 1” wider, go up to #3 and #5 needle sizes. For a tiny, newborn size, use Lion Baby Soft and sizes #1 and #3 needles.