This is a small newborn cardi. I would say up to 6 pounds. It could even be used for a larger preemie.

Knitted
Top-down
One-piece then the sleeves are worked in the round.

Stitches used:
knit
purl
garter
stockinette
kf&b
buttonholes
bind off

Knowledge of double-pointed needles or magic loop method needed for sleeves.

This pattern is very versatile. I’ve knitted it with ribbing instead of garter stitch edging and I have also added lace to the body.