This pattern is designed as photo prop.
Romper is knitted in stockinette stitch 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: worsted weight, I have used: Himalaya Everyday 250m/ 100gr for MC
and Nako Paris 245m/ 100gr for CC
Needles: 7US, 4.5mm – selection of DPNs & circular 32”
Crochet hook: 4.5mm