There’s one tiny side-effect of knitting things seamlessly that have appendages — as in, a mitten with a thumb or a top-down sweater with two sleeves. There’s a moment where you set aside those thumb/sleeve stitches on waste yarn, carry on with the hand/body, and then come back to do the appendage. You put those live stitches back onto needles, pick up a few stitches around the top of the thumb or the underarm of the sleeve (pictured above) to complete the circle, and then knit the rest of the appendage. The side effect being that you will inevitably have a little hole at either end of the picked-up stitches. This isn’t a flaw of your knitting or of the pattern — it’s just a fact of life. Patterns will often tell you to simply take the yarn tail from where you reattached yarn at that point, and weave them closed. But there is also a simple way to minimize them, which is to pick up an extra stitch in that spot — in the gap between the live stitches and the picked-up ones — and then knit it together with the adjacent stitch on the next round, so you haven’t thrown off your stitch count.
There’s still a chance you might need to do a little refining with your yarn tail at the end, but the holes will be noticeably minimized.
For the sleeves of the sweater pictured, I have 40 stitches on waste yarn and need to pick up another 10 along the edge of the underarm, starting at the center of the underarm stitches. So I’m picking up 5, then knitting the 40, then picking up another 5. However, to help bridge the gap, I’ll actually pick up 6.
Top photo: You can see the live sleeve stitches that have been hanging out on waste yarn, placed back onto a needle, and to the right is the cast-on edge of the underarm.
Middle photo: I’ve picked up my designated 5 stitches along the underarm edge, but you can see there’s a good 3/4″ between the underarm stitches and the sleeve stitches — that’s your future hole.
Bottom photo: I’ve plunged my needle behind both legs of the stitch right at the corner, halfway between the underarm and sleeve stitches, and picked up one extra stitch, which I’ll knit together with the adjacent sleeve stitch on the next round.
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