Creating a box bottom on your dolls creates a flat bottom to allow them to sit sturdier. It may sound like a difficult task, especially if you're a beginner; but it's easy! Just follow along with my free tutorial and you'll be creating box seams in no time!
 

Step 1: Stitch your pattern design on doubled fabric using a 1/4" seam (or, stitch on the fabric, then cut out 1/4" from seam). The bottom of the doll should be flat; and you should stitch around the entire pattern, leaving only a 2-3" opening in the bottom.

Step 2: Separate the front fabric from the back fabric, then match up the bottom seam with the side seam.

Step 3: Pin the seams together so they don't slip when you sew.

Step 4: Measure about 3/4 to 1 1/2" from the corner (here I have measured 1 1/4") and draw a line perpendicular from the seam. The farther from the corner you sew, the wider your bottom will be.

Step 5: Stitch along your marked line. Repeat steps 2-4 for other side.

Step 6: Clip the corners off 1/4" from stitching.

Step 7: Now you can turn and stuff your doll! Stuff the bottom with poly pellets, rags, or other weighty item to give your doll extra support for sitting.

I hope you enjoy my free crafting tutorials I have created for you! Feel free to link to my tutorials or use the information to create your own primitives; but please do not publish my tutorials or the directions in any form including on the web and in patterns. Thank you!