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For bibs I like to use Troitskaya "Podmoskovnaya" yarn. It produces light but warm items.I will immediately note that the bibs can and, perhaps,you even need to knit a whole piece of fabric on circular knitting needles, without seams. I don't like this method of knitting, although it has its advantages. I like to knit on two simple knitting needles. After knitting, I sew the product and steam it.For a 9 year old girl I cast on 80 stitches and knit2x2 elastic. The fabric is knitted evenly, without changes to the required length (you can measure on the child - by the length of the neck), then I knit 2 rows of purl stitch - for the fold of the collar of the bib. We continue knitting with a 2x2 elastic - we knit the same number of rows as there were before the fold + a couple more rows. Next comes the chest part of the bib. All knitters knit it differently. I like an even front surface with increases, like for a raglan. To do this, I conditionally divide the fabric into 4 parts: the front and back are a little larger, the shoulders are a little smaller. So, I divided 80 loops into 30 each - for the front and back and 10 each - for the shoulder lobes. Now we begin knitting: 1 row: 1 edge, 13 persons. (half of the back), 1 increase, 2 persons., 1 increase, 8 persons. (shoulder), 1 increase, 2 persons., 1 increase, 28 persons. (front), 1 increase, 2 persons., 1 increase, 8 persons. (shoulder), 1 increase, 2 persons., 1 increase, 13 persons. (second half of the back), 1 purl-edge. At the end of the row we check: there should be 88 loops.Row 2 (purl) and all subsequent even rows – knit all purl stitches, without increases.3 and subsequent odd rows are knitted in the same way,like the first one. That is, we add 1 loop in the same places, keeping 2 front loops between the added loops – after a couple of rows, this path of front loops becomes clearly visible.We knit in this way until the required length (hereeveryone has different tastes) and close all the loops. I knit a little differently. I close the loops gradually, starting from the back. I decrease 5 loops at the beginning of each new row. Thus, on the back my bib is shorter, on the shoulders it gradually lengthens, and on the child's chest it will be the longest part.There is one more trick.The last few rows before closing I like to knit not with the stockinette stitch, but with the garter stitch. This way, the edges of the bib will not curl. The product is ready. It can be sewn, steamed and worn with pleasure!