This cardigan is made without seams!
Matching booties you can find here: http://www.ravelry.com/patterns/library/polka-dot-baby-ma...

Sizes:
I suggest to work with sport weight yarn and crochet hook 3,5 mm (E) to make it in size 1-3 months, or with DK-weight yarn and crochet hook 3,75 (F) for size 6-9 months.

Finished Chest:
1-3 months (6-9 months) – 17 (21)in. or 43 (53.5) cm

Finished Length:
1-3 months (6-9 months) – 9 (10)in. or 23 (25) cm

Materials:

 100gr sport weight yarn (or 150gr DK- weight yarn ) - 100% merino wool
 crochet hook 3.5mm E (or 3.75 F), or size needed to obtain gauge.
 4 buttons