This pattern is designed as photo prop.
Romper is knitted tops down, 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: DK weight, I have used Nako Calico 245m/ 100gr
Needles: 6US, 4.0mm – selection of DPNs & circulars 18”/32”
Crochet hook 4.0mm

Gauge: 21sts x 26rows

Skill level required: Intermediate
CO = long tail Cast On method
K = knit stitch
P = purl stitch
sl1 = slip one stitch knitwise
K2tog = knit two stitches together
ssk = slip, slip, knit two stitches together through back loop
sk2psso = slip one st, knit next two stitches together, pass slipped stitch over K2tog (double decrease)
YO = yarn over
RS = right side of work
WS = wrong side of work
sts = stitches