This sweater is knit from the top down with just one seam at the top of the hood. The body is worked flat; the sleeves are worked in the round. Stitches are picked up along each side edge and around the hood to work the mosaic button band. The mosaic band is created by using the mosaic technique, which means you only use one color per row and slip the other.
Instructions and links are included for the different techniques used in this pattern.

Sizes: 12 mos. (18 mos., 2 yrs., 4 yrs., 6 yrs.)
To fit chest circumference: 18 (19, 21, 23, 25) inches or 45.5 (48.5, 53.5, 58.5, 63.5) cm
Finished garment (buttoned) chest circumference: 23.75 (24.75, 26, 27.5, 30) inches or
60.5 (63, 66, 70, 76) cm.

Yarn Requirements:
MC: 567 (577, 600, 652, 730) yds or 518 (527, 548, 596, 668) m DK weight yarn
CC: 48 (48, 48, 48, 50) yds or 44 (44, 44, 44, 46) m DK weight yarn
Note: I used Tahki Yarns Classic Superwash DK in the sample. I have also successfully used Cloudborn Fibers Superwash DK. You may substitute any yarn of a similar weight, just be sure to check your gauge to make sure you have enough yarn to complete your sweater.

Needles:
29-inch US 5 (3.75mm) circular needles and set of double pointed needles
32-inch US 6 (4mm) circular needles and set of double pointed needles

Notions:
4 normal stitch markers and 4 locking stitch markers (or pieces of scrap yarn)
tapestry needle
2 stitch holders or pieces of scrap yarn
8 3/4 inch buttons or 1 inch toggle buttons

Gauge:
21 sts and 28 rows = 4 inches / 10 cm in Stockinette Stitch using larger needles after blocking

Skills Required: binding off, knitting, purling, working in the round, working flat, increasing, decreasing, picking up stitches, cable cast-on, backward loop cast-on, seaming, long tail cast-on.

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This pattern has been tested and was tech edited by @rhyflowerknits