Selbu style stranded child mittens. It’s not a detailed pattern, only charts offered on blog. Size depending on your gauge, but appr. 3-8 years, I would think.
Yarn weight
Fingering (14 wpi) ?
Gauge
30 stitches and 34 rows = 4 inches
in stranded colourwork
Needle size
US 1½ - 2.5 mm
Yardage
219 - 273 yards (200 - 250 m)