Cut a rectangle of pre-washed fabric measuring 45 inches by 53 inches. This is exactly 16 inches longer on each side than the standard 29-by-37 Pack 'n Play mattress.
Old flat sheets can make great Pack 'n Play sheets, or you can pick a fabric that matches your design scheme.
Cut off an 8-inch square at each corner of the fabric. This is most easily accomplished by folding the fabric in quarters so all the corners are together, and then cutting all four layers at once.
Sew the cut edges in each corner together with a straight stitch. To do this, fold the sheet so the patterned side is in the middle and you see the reverse, and line up the edges you had just cut in a corner.
Your stitch should be about 1/4 inch from the cut edges.
Fold over 1/4 inch of the edge of the sheet and iron it all the way around. Then fold over another 3/4 of an inch and iron it as well.
Sew around this hem using a straight stitch 5/8 inch away from the edge of the sheet to make a casing. Leave a few inches open in the corner so the elastic can be added.
Thread the elastic all the way around the sheet in the casing. It is easier to thread if you attach a safety pin or other rigid object to help pull it through.
Sew together the two ends of elastic, and then sew the last bit of the casing closed.
Things You Will Need
- Sewing machine with thread
- 1/2-inch piece of elastic, 75 inches long
- Save the four corners of fabric you cut off to make another project that coordinates with the Pack 'n Play sheet. They can be included as squares in a quilt or cut into animal shapes, sewn together and stuffed to make small toys.
- Elastic can also be sewed onto the inside of the fitted sheet without running it through a casing. To do this, just stretch the piece of elastic as you sew it on using a zig-zag stitch so the thread will stretch as well.
- The most common types of fabric for a project like this are cotton, polyester or a blend of the two. However, you should feel free to experiment with other types of fabric so long as they are soft and comfortable for your baby.