1 skein of worsted weight yarn (I prefer Caron Simply Soft). You will need to use two strands, so either separate into two separate balls, or use a strand from the center as well as the outside of the yarn ball.
4 US size 8 double pointed needles
Small stitch holder (I just use a piece of string)
Gauge: 16 stitches = 4 inches (remember that you're working with two strands of yarn, so although the gauge may look wide for a toddler's wrist, it's also extremely thick.)
4.5 (5.5) inch wrist
With a loose cast on, such as the German Long-tail or Long-tail, CO 20 (24) stitches using TWO strands of yarn. Divide stitches onto the double pointed needles as follows: 5 (6) stitches on Needles #1 and #3, and 10 (12) stitches on Needle #2. Place marker for working in the round. Work K1, P1 ribbing for 3 ½ inches.
Palm for Left Hand:
Switching to stockinette stitch, work for 1 (2) inch(es). Then, knit across to last stitch on Needle #1. Place last 3 (4) stitches worked on a stitch holder, K1. Knit across Needles #2 and #3. On the next round, on Needle #1, K1, CO3 (4), K1. Work across all needles, and continue working stockinette until mitten reaches 7 (8) inches from cuff bottom.
Palm for Right Hand:
Switching to stockinette stitch, work for 1 inch. On next round, knit across Needles #1 and #2. On Needle #3, K4, place last 3 (4) stitches worked on a stitch holder, K1. Knit across Needles #1 and #2. On Needle #3, K1, CO 3 (4), K1. Continue working stockinette until mitten reaches 7 (8) inches from cuff bottom.
Round 1: On Needle #1, K to within 3 stitches of the last stitch. K2tog, K1. On Needle #2, K1, SSK, knit to within 3 stitches of last stitch, K2tog, K1. On Needle #3, K1, SSK, knit the remaining stitches.
Round 2: Knit across all needles
Continue rounds 1 and 2 until there are 8 stitches remaining on the needles. Join stitches from Needles #3 and #1, and close with Kitchener stitch.
Slip 3 (4) stitches from the stitch holder onto first needle. With second needle, PU and K 1 stitch from side edge, and 2 (3) stitches from CO edge. With third needle, PU1 stitch from CO edge and 1 stitch from side edge (8,10 stitches). Work stockinette in the round for 2 (2.5) inches. To close, leave a 12 inch tail, and weave through all stitches on the needles. Pull firmly to shut, knot, and finish off.