Does this little kid look like Thumbelina, or is it just me? I think the colours make it modern, and I'm just imagining this all done in white if the baby is a bridesmaid/flower girl with buttons to match the theme of the wedding... I'm all for that, and with the raglan sleeve this is going to be a great knit for any little one in your life.
This has been sampled for the pattern in King Cole Cotton Top DK, but you can use any King Cole double knit yarn. You're going to need 3.75mm and 4mm needles. If you're making the cardigan or the hat, you'll also need 4.5mm needles. You'll need some buttons for all of them.