Haha, hold on, now.

[Childe appreciates this kid's enthusiasm, taking out a few pieces of precut fabric for him and a little stuffing along with a needle and thread.]

There's no spell, it's just a little bit of luck that's needed. You'll see in a moment. Why don't you stitch this together? Make sure you put that stuffing in before sealing it up, though. I think it's best you experience it for yourself before I explain it to you.