New at knitting

Hi Newatthis. I’ve just looked at a size chart online that suggests 24 inch chest is for a 3 year old. It does depend on if you knit tightly or loose but I’d say it’s better that it’s a bit big than too tight. You don’t know how long it will take you to knit and sew it up and then post it abroad.
Also cardigans are often worn over something else - a t shirt or blouse.
Good luck , and just as importantly, enjoy. Maybe come back on and show us a photo when you’ve finished it?

Thank you for this info. yes, I expect it will take me a long time - maybe I should just hedge my bets and go for a teenage size (tee hee). I really envy anyone who can knit quickly. My aunt could knit without even looking at the work whereas my eyes have to be glued to every stitch. I'll try the 24 inch. What about 0-6 months ? What size would that be?

Hi, that’s a tricky question New because it depends on the weight/size of the baby at birth and how quickly it gains weight.
My DD2 was a chunky 9 pounder and needed 6 months age clothing from the get-go!
What if you knit a matinee jacket that’s a loose fit and pick a pattern that is for a 6 month old? Baby can always ‘grow into it’.

16-18 inches would be the size roughly, for a 6 month old.

Yes, I'd say 24" chest for an average 3 year old.
I don't think any of mine were in 16" except the smallest at birth. 3-6 months would be about 18" and 6-12 months 20".

However, DGS was in 6-12 months size at birth.

I would knit a pattern without bottom ribbing for a baby btw.