This pattern is designed as photo prop.
Romper is knitted in stockinette stitch 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: DK weight, I have used Stylecraft Special dk 295m/100g
Buttons 12mm – 5pcs
Needles: 6US, 4.0mm – DPNs & circular 32”
Tapestry needle