OMG too cute for words!
there is a sweater to match as well!

Free pattern here: link text

Youtube tutorial for 6 month size here: link text

Using Wool Ease yarn and 3.5 at waist and 4 mm for everything else

6-9 month size
4mm chain 85 sts
3.5mm sc in first 10 sts switch to 4mm hook HDC into next 58 sts, then still using 4 mm finch last 16 sts in sc
next rows will be same but in back loop only for 30 rows