Birkes Romper is worked from the bottom up, both flat and in the round, using 1 strand of either Merino, Cotton Merino or Pure Silk. It features an easy to work colorwork pattern where you only work with 1 color per round/row.
You start by working the two crotch pieces separately back and forth, before work is joined on the same needle and continued in the round up to the underarms. Sleeves are worked in the round and joined with the body at the underarms. Yoke is shaped with raglan decreases, initially in the round and later back and forth. The romper has a little back split that is closed with 1 button and a crochet loop. Garter edges finish the sleeves, leg openings and neckband, while the crotch is closed with 4 buttons.
The colorwork pattern is charted only.

Sizes: 1-3 (6, 9, 12, 24) months
Finished measurements: Total length from shoulder to crotch: approx. 36 (38, 41, 44, 48) cm 14¼ (15, 16¼, 17¼, 19)”; Chest circumference: approx. 42 (45, 47, 49, 54) cm 16½ (17¾, 18½, 19¼, 21¼)”; Sleeve length from underarm to edge: approx. 14 (16, 18, 21, 24) cm 5½ (6¼, 7, 8¼, 9½)”
Yarn: Knitting for Olive Merino, Cotton Merino or Pure Silk (250 m 273 yd / 50 g 1.8 oz), fingering-weight yarn, 1 (2, 2, 2, 2) balls in color 1 and 1 (1, 2, 2, 2) balls in color 2. Sample is in Merino in Cardamom (color 1) and Cream (color 2) colorways
Needles: 2.5 mm / US1.5 and 3 mm / US2.5 circular and double-pointed needles, or in size to obtain gauge
Gauge (after blocking): 34 sts and 48 rows = 10 cm 4” in pattern (Chart B) with 3 mm / US2.5 needles
Notions: Stitch markers, waste yarn or stitch holders, tapestry needle, crochet hook, row counter (optional), 5 buttons (diameter: 12 mm ½”)