I used to do lots of knitting, and enjoyed doing crochet as well, there are some great tips already given.
Just wondering whether it might be an idea to pick up a stitch from each row of the hood, and (working in stocking stich) make the band slightly wider than pattern states. Fold over, and thread elastic through to tighten the hood snugly round the child's face. Not sure whether that would work.
When knitting a cardigan or jacket, rather than picking up stitches to make the button band round the front, I used to add the number of stitches to pattern, and knit the band (using rib stitch) as I was doing the fronts. If you do the side which doesn't have button-holes first, you can calculate where the button holes can be made.
It saved a lot of time and always looked neater, especially if you slip the first stitch, rather than working it. Tightens it up.
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