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DIY Doll Cot Mattress: Easy Sewn Cover + Filling

How to make a mattress for a doll’s cot?

A doll’s cot mattress is a quick, satisfying craft that can make playtime feel more “real” without spending much. The key is getting the size right, choosing a filler that won’t clump, and finishing the edges so it holds its shape after lots of pretend naps.

1) Measure the cot interior

Measure the length and width of the cot where the mattress will sit. Subtract about 1/4 inch from each measurement so the mattress slips in and out easily, especially if the cot has rails or a tight frame.

2) Pick your materials

For the cover, use cotton quilting fabric, flannel, or a soft pillowcase scrap. For filling, polyester fiberfill is the easiest and stays fluffy. If you want a flatter look, cut a piece of foam, felt stack, or batting to the same size as your finished mattress.

3) Cut and sew the cover

Cut two rectangles of fabric: your finished mattress size plus a 1/2-inch seam allowance on all sides. Place right sides together, sew around the edges, and leave a 2–3 inch opening on one short side. Trim corners to reduce bulk, then turn the cover right-side out.

4) Stuff (or insert) evenly

Add small handfuls of fiberfill and push it into the corners first, then fill the center. Keep checking the shape so it stays level instead of lumpy. If using foam or batting, slide it in carefully and smooth it flat with your fingers.

5) Close and finish

Tuck the raw edges of the opening inward and hand-stitch with a ladder stitch for a neat seam. For a more “mattress-like” look, add a few simple tack stitches (tufts) through the center using a needle and sturdy thread.

For extra tips, sizing guidance, and material ideas, see the full tutorial here: How to Make a Mattress for a Doll’s Cot.

FAQ

What fabric works best for a doll cot mattress cover?

Cotton quilting fabric and flannel are both great because they’re easy to sew and hold up well. If you want a smoother finish, use a tightly woven cotton that won’t stretch while you stuff it.