In my Waldorf kindergarten classroom I pre-cut the shape and depending on the age of the child, boy or girl, I might do further prep. For three years olds I made tiny hole punches and they used blunt needles and thin ribbon or thick floss. Four year olds might use a large sharp needle and I would use a sharpie to make dots to guide them. Most five and six year olds were independent in sewing and could learn other stitches besides a running stitch. Is it important for three and young four year olds to sew? Perhaps not, but in the context of family activities or a mixed age classroom it is wonderful for them to be involved, especially if they are interested and so not want to be left out.
On my work table I have pre-cut egg shapes, buttons, bric-a-brac, hole punched felt shapes, ribbon and many colors of floss.
I have fun linking up with other crafty blogs and they are listed HERE.