This pattern is designed as photo prop.
Romper is knitted bottoms up, mainly in rounds on double pointed needles as one piece as much as possible (to avoid sewing pieces together).
Size: newborn (up to 1 month old baby)

Materials used:
Yarn: Aran weight, I have used Drops Air 150m/50g
Needles: 8US/ 5.0mm DPNs
Button 20mm – 2 pcs

Skill level required: Intermediate
CO = Figure-8 CO = https://www.youtube.com/watch?v=7LvanJobvjo
K = knit stitch
P = purl stitch
sl1 = slip one stitch knitwise
K2tog = Knit Two Stitches Together
ssk = slip one stitch, slip one stitch, knit both slipped stitches through back loop
m1L = make one left
m1R = make one right
sk2psso = slip 1 stitch knitwise, knit 2 stitches together, pass slipped stitch over
YO = yarn over
RS = Right Side of work
WS = Wrong Side of work
sts = stitches
BO = simple bind off method

Gauge: 17sts x 22 rows for 10x10cm