So fast!

Used the pattern as stated for a 3-6 monthish size with my tension.

Modified the pattern to newborn-ish size:

Cast on 24
Knit 1 row
Knit 5 increase rows
Knit 3 rows
Knit 5 decrease rows
The rest is as written in the pattern:
At the start of the next two rows, cast off 4 stitches and knit until end of row
Knit 8 rows
Fold in half, sew seam, fold cuff, embellish