How to Sew a Fitted Crib Sheet

On this page (9 sections)

1. What do you need to sew a fitted crib sheet?
2. How do you measure the crib mattress?
3. How large should you cut the fabric?
4. How do you sew the corner pockets?
5. How do you add elastic to a fitted crib sheet?
6. How do you check the finished sheet's fit?
7. What if you want to buy a fitted sheet instead?
8. How can you care for a homemade crib sheet?
9. How to sew a fitted crib sheet that fits

To sew a fitted crib sheet, measure the mattress, add room for its depth and hems, then sew elastic into the corners so the finished sheet fits snugly. Check it on the bare mattress before using it.

This guide walks through a simple method for making fitted crib sheets with corner pockets and elastic. Mattress dimensions vary, so measure yours instead of relying on a standard size.

What do you need to sew a fitted crib sheet?

You need fabric, elastic, thread, scissors, pins or clips, and a sewing machine. A tape measure and washable fabric marker help you mark the pattern accurately.

Choose fabric that can be washed and dried according to its care instructions. Prewash it if the care label allows, then dry it before cutting so later shrinkage is less likely to change the fit.

If you'd rather buy a ready-made option, our crib sheets buying guide explains what to compare. It also helps to understand what size a crib sheet should be before you start cutting.

How do you measure the crib mattress?

Measure the mattress length, width, and depth with a tape measure. Measure the mattress itself, including any rounded corners, and write each measurement down.

Don't use the mattress label as a substitute for measuring. Even mattresses described as standard crib size can differ slightly, and a few inches can change whether a finished sheet stays secure.

Record:

• Length from end to end
• Width across the widest part
• Depth from the top surface to the bottom edge

A fitted sheet needs extra fabric to cover the mattress sides and tuck underneath. The amount depends on the mattress depth, your seam allowance, and how much fabric you want under the mattress.

How large should you cut the fabric?

Cut one large rectangle using the mattress measurements plus fabric for the sides, corner pockets, and hems. A common starting formula is:

Cut length = mattress length + 2 × (mattress depth + tuck-under allowance + seam allowance)

Cut width = mattress width + 2 × (mattress depth + tuck-under allowance + seam allowance)

For example, if your mattress measures 52 x 28 x 6 inches, and you plan 4 inches for fabric to tuck under plus 1 inch for seam allowance on each side, the rectangle would be 74 x 50 inches. This is a planning example; adjust the tuck-under and seam allowances for your sewing method.

Mark a square at each corner. Its side length should equal the mattress depth plus the tuck-under allowance and seam allowance.

Test your measurements with a paper pattern or inexpensive fabric if you aren't sure about the fit.

How do you choose the corner square size?

Use a corner square that matches the mattress depth plus the fabric needed to tuck underneath. Add a seam allowance so the sewn pocket doesn't come up short.

A shallow pocket may pull the sheet off the mattress. A very deep pocket can leave extra fabric underneath, so check your calculations before cutting the main fabric.

How do you sew the corner pockets?

Cut out the four marked corner squares, then bring the two cut edges at each corner together with right sides facing. Sew each pair with a straight seam and finish the raw edges so they are less likely to fray.

Repeat for all four corners. Turn the sheet right side out and check that each corner forms a pocket deep enough to cover the mattress edge.

How do you add elastic to a fitted crib sheet?

Add elastic around the full edge or at the corners, depending on your pattern. Elastic at each corner is a straightforward option when you want a simpler sewing step.

For corner elastic, fold and press a narrow hem around the sheet edge, leaving an opening at each corner if you are making a casing. Feed elastic through each casing, secure its ends, then close the openings and finish the seams.

You can also sew elastic directly to the fabric while stretching it gently between marked points. Follow the elastic maker's instructions for handling and stitching, and avoid stretching the fabric unevenly.

How do you check the finished sheet's fit?

Put the sheet on the mattress and check that all four corners stay covered without loose fabric on top. Smooth the surface and look for edges that lift or pockets that feel stretched.

If the sheet is loose, revise the pattern or shorten the elastic slightly. If it pulls hard or won't cover the mattress edge, add depth or tuck-under room to your pattern.

Always check the sheet on the mattress it was made for. Don't use it if it shifts, bunches, or comes loose when fitted.

What if you want to buy a fitted sheet instead?

Buying a sheet can save sewing time, but you still need to match its stated mattress size and depth to your own. If you are comparing bedding layers, see mattress pad versus crib sheet differences.

Our guide to flat crib sheets covers why a flat sheet is a different choice.

The American Baby Company 3 Pack 100% Cotton is described for mini crib mattresses measuring 24 x 38 inches. Its elastic runs around the edge, so check your mattress size and depth before choosing it.

The KeaBabies 2pk Organic Cotton Crib Sheets are sized for standard crib mattresses measuring 52 x 28 inches, with a stated mattress height range of 3 to 8 inches. Compare that range with your mattress before buying.

The Konssy 2 Pack Muslin Crib Sheets are designed for a 52 x 28 inch standard crib mattress and have fully encased elastic. Follow the care instructions and wash before use.

For a toddler bed, see our guide to the best toddler crib sheet set and whether crib sheets fit toddler beds. If you're planning a nursery around a convertible crib, learn what makes a crib convertible for a growing family.

How can you care for a homemade crib sheet?

Follow the fabric and elastic care instructions, and wash the sheet before its first use. Keeping a spare can help when one is in the wash; see how many crib sheets you need.

Check the seams, elastic, and corners after washing; repair damage before using it again.

Keep the sleep space simple and use only a fitted sheet that stays firmly on the mattress. A waterproof crib mattress cover can add a separate layer under the sheet, while crib comforter sets for girls can help with nursery decor outside the sleep space.

How to sew a fitted crib sheet that fits

To sew a fitted crib sheet, use your mattress measurements to plan the rectangle and corner pockets, then attach elastic and check the fit on the mattress. The mattress depth and tuck-under allowance determine how much fabric each side needs.

Choose sewing if you can measure and check the fit carefully. Choose a ready-made sheet if its dimensions match your mattress and you prefer not to make one.

Frequently asked questions

What fabric is best for a fitted crib sheet?

Choose fabric that can be washed and dried according to its care instructions, and check that it feels comfortable to you. Cotton is a common choice.

Prewash it before cutting if the care label allows, since fabric can shrink after sewing.

How much fabric do I need to make a crib sheet?

The amount depends on the mattress length, width, depth, and the extra fabric you need for hems and corner pockets. Measure the mattress first, then calculate the cut size before buying fabric.

A standard crib mattress is often about 52 x 28 inches, but measure yours.

How do you make the corners of a crib sheet?

Cut a square from each corner of the fabric, fold and sew the matching edges together to form a pocket, then add elastic around the edge or through a casing. The pocket depth should account for the mattress depth and enough fabric to tuck underneath.

How tight should a fitted crib sheet be?

The finished sheet should fit snugly over the mattress, with no loose fabric or corners that lift easily. Check the fit on the mattress before use.

If the sheet shifts, bunches, or pulls off, adjust the pattern or make another sheet that fits securely.