So . . . let's talk knit for a minute. My feeling is that it's easier to sew with knits than with quilting cottons for children's clothing. Plus your kids will appreciate the comfort. There's just a FEW LITTLE THINGS you need to know before you sew with knits.
1. Prewash, prewash, prewash. Knits shrink A LOT the first time you wash them. (I've heard up to 15 percent.) I washed mine in hot water and then dried them in the dryer.
2. Use polyester thread. It has a little stretch. Which is a good thing with a stretchy fabric.
3. While you're at it, use a slight zigzag to sew. Those zigzag stitches have a little stretch too. I set my zigzag on 1.0 width and 2.0 length.
4. If you use a ballpoint needle it won't snag your fabric. You can find these at any sewing store with the other machine needles.
5. Knits don't fray, so no need to finish the seams!!! However, I love to use my double needle (twin needle) to make a professional looking seam finish. (Can you see it below?)
Girl's World too! You won't regret it. Then add it to the Back to School in Style Challenge flickr group. You could win some great prizes!