There is an adult version of this pattern: https://www.ravelry.com/patterns/library/namya

This pattern is also included in the e-book “2 generations knitwear”.
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This sweet, little cardigan is an easy, perfect “first knit” for a baby or toddler/child. It is completely seamless, and as it is knit top-down you could customize length to the body, sleeves and frills (and even omit the frills, if you prefer to work ribbed edges for a boys version;))

Sizes
Finished chest circumference, buttoned: Size 1: 3-6mo: 47cm/18.5” / Size 2: 6 – 12 mo 51cm/20” / Size 3: 12mo – 15 mo 56cm/22” Size 4: 18 mo – 2 yrs 60cm/23.5”/ Size 5: 2 yrs – 3 yrs 64cm/25” / Size 6: 4 yrs – 5yrs 68cm/26.5”.

Materials
YARN:I used the soft and lovely, 100% alpaca-yarn, “Indiecita” from Filcolana, to work the cardigan. This yarn comes in balls of 50gr/1.75oz and 160m/175yards. You will need 2/2/2/2/3/3 balls of this yarn.
NEEDLES: You need straight, or circular, needles 2.5mm/US1.5 to work the upper body, a circular needle 2.5mm/US1.5 for the lower body, dpns (or a long, circular needle, if working the magic loop). Needle size is a suggestion, you need to choose needles to obtain gauge.
A crochet hook for the buttonhole band, the neck edging, the button band.
MATERIALS: 8 buttons, 0.8mm/0.3” across. Tapestry needle. Blocking tools.

Gauge 27 sts in stockinette = 10cm/4”

The pattern The pattern is comprehensible and easy to follow. All measurements are given in cm’s as well as inches. There is a schematic.

Knitting skills Techniques involved: provisional cast-on, picking up sts. Simple crochet (single crochet and chains only).