How to seam a knitted baby jumper

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Baby jumpers are often knitted in pieces that have to be sewn together before the jumpers is wearable. Just as when sewing clothing, seams that frequently need to be sewn are those beneath the sleeves, up the sides and across the shoulders. Mattress stitch is the hand-sewing technique most commonly used for seaming knitting, because it leaves a minimal line with virtually invisible stitches. Knitting seamed with mattress stitch will look as though the knitted stitches are continuous.

Sewing vertical seams

Block the pieces of your baby jumper to make seaming them easier. Fill a sink with cold water and add wool wash according to the directions on the bottle. Soak the pieces for 30 minutes, then rinse out the soap by running cold water through the knitting and gently squeezing it. Spread the pieces flat on a large towel laid over an ironing board. Use straight pins to pin the pieces through the towel and into the pad on the ironing board. Allow the pieces to dry.

Sew vertical seams, such as sleeve seams running from wrist to ankle, by first lining them up alongside each other and connecting them at the bottom. Cut a piece of yarn twice as long as the seam and thread it through the eye of a darning needle.

Hold the bottom edges of the piece together and sew the yarn through both of them from the front. Pull the yarn through until most of it is coming out from beneath the left side of the jumper, leaving a 7 cm (3-inch) tail coming out from under the right side. Tie the two pieces together in a knot.

Locate the first full vertical row of stitches after the side edge, counting in horizontally. In stockinet stitch, this will look like a row of Vs. Sew underneath and behind the first bar of the first V in that row on the right side. The yarn will come out on the back side of the jumper.

Sew underneath and behind the first bar of the first V in the corresponding vertical row on the left-hand side. Go back to the right-hand side, with the yarn coming from underneath, and sew underneath and behind the first bar of the third stitch up from the bottom. You are picking up the bars between the last and the edge stitch on the right and between the edge and the first stitch on the left.

Sewing horizontal seams

Line up the edges of the horizontal seams on blocked pieces of knitting. Tie a knot at the right edge of the seams to join the pieces, just as you did for the vertical seams.

Slide your needle through both legs of the first V in the second horizontal row from the seam on the piece of knitting farthest from you. For example, if you were sewing a neck-to-shoulder seam, you would tie the pieces together at the neck edge and pick up the first stitch on the back panel of the jumper.

Pick up both stitches of the first V in the corresponding row on the piece of knitting closest to you. This would be the front panel of the jumper.

Pick up both stitches of the second V of the back row, then both stitches of the second V of the front row. Continue in this manner until you reach the end of the seam. Weave in the tails of the yarn with the darning needle or use them to sew another seam, depending on your pattern directions.

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