1. Preparation materials: buy wool balls with appropriate colors and prepare appropriate sticks, large pins, crochets and sewing needles.

2. Determine the number of stitches: The number of stitches depends on the size of the body and the thickness of the wool. Generally speaking, the thread length of a 2-year-old baby is about 35cm, the thick thread is about 160 stitches and the thin thread is about 200 stitches. Because everyone's gestures lead to different tightness, it is suggested that you can first determine the baby's body shape, then weave a sample, and then convert the specific number of stitches according to the size of the sample and the ratio of the number of stitches.

3. Knitting the back piece of sweater vest: holding the needle in the left hand, dividing the thread with the thumb and forefinger of the right hand, winding from bottom to top, and winding alternately until the number of needles is determined. The second row: first knit with the lower needle, and then alternately knit with the upper and lower needles. Other threads: Different threads have different knitting methods, which can be knitted up and down like a second thread or like a video.

4. The length of knitting to the armpit needs to be reduced. 2. Knit into 1 stitch, generally 6 stitches, and reduce 6 stitches on the reverse side, and then continue knitting. Knit around the neckline, and gradually reduce the knitting shoulder of the knitting needle. Knit one shoulder first, then the other. The knitting method of the front piece of wool vest is the same as that of the back piece, but the front piece usually needs to knit various patterns, and the specific position of the patterns can be judged by the back piece on which line to start and end.

5. Knit the front piece to the position where the pattern is to be knitted, and add different colors of wool for knitting. Sew the front piece and the back piece together: sew the shoulders with crochet. Thread the thread under your armpit with a sewing needle, and then pick up the thread and sew it. Knitting neckline: Pick the neckline with a stick needle, and then knit the neckline with three pieces. Turn the clothes upside down, and then knit the clothes and the collar together. The cuff part is knitted in the same way as the collar part. First pick the needle on the cuff, then knit the cuff with three needles and then knit together.

6. Winding: Use crochet to transfer the long thread to a farther position along the knitting track, and then disconnect it. On the front, the letter patterns are stitched with stitches through cross stitch.