From the Knit Rowan website:
Knit this snuggly cardigan, a design from the Rowan archive originally featured in Classic Babies. Designed by Martin Storey using Baby Merino Silk DK, a luxury machine washable yarn designed specifically for babies (merino superwash wool and tussah silk), this design has basket detail pockets and flower motifs along the collar.

Additional information:

For 0-3 months (16” chest) and 3-6 months (18” chest):
3 balls of Cloud805 (blue) and 1 ball of Imp803 (orange)

For 6-12 months (20” chest) and 12-18 months (22” chest):
4 balls of Cloud805 (blue) and 1 ball of Imp803 (orange)

For all sizes:

6 buttons (can use Rowan button 00394)

Oddments of yarns Borage806 (purple), Pixie807 (pink) and Limone802 (yellow) for flowers and flower basket embroidery.

Embroidery skills: Lazy daisy stitches and the french knot