I'm on the second sleeve of the first little cardigan, although I think I will lengthen the cuff on the first sleeve so that it can be folded back initially - one of the benefits of knitting from the top down.
The size I'm doing is supposedly for age 6, because the choice was 4yrs or 6yrs and the girls are 3 (but tall for her age) and 4.5, but the sleeve length is 11in, and when I measured their arms last weekend they were 10in.
I used dpns for the sleeves in the end, and got into a good rhythm. I did learn that 10cm dpns are a Bad Idea. I ordered them because I could get them a lot more quickly than 15cm ones, but almost got a blister at the base of my thumb after doing just 5 small rounds!