Baby knit sweater vest pattern / easy knitted top for toddler

The cozy sleeveless sweater vest can be worn by babys all year round. In winter it warms as a
top under thick clothes, in summer airy over a shirt. Knitted bottom up, it gets its shape by alternating knits and purls.

You should be able to do: knits and purls, cast/bind off stitches, yarn overs

The pattern contains 5 sizes:
Newborn to approx. 4 years old kids

YARN
Aran, 10-12 ply with a yardage of approx. 160m / 100g, for example:

Big Merino Hug from Rosy Green Wool
Big Merino from DROPS
Bingo from Lana Grossa
Bio Lana from Mondial

NEEDLES
Circular knitting needdle 5.0 mm (8US / 6UK), length 40 - 60 mm, depending on size