I have the mattress at the highest setting for a newborn, but you should make the crib skirt to hit about an inch off the ground from the lowest mattress setting. Mine was about 12 or 13″ long.

Cut out your 3 pieces

{front and two sides, no need to do the back}, using the height you just measured and the width of the crib. I added extra fabric so I could do a pleat in the middle.

Cut out your crib skirt panel

This is the piece that tucks under the mattress. I pieced this together from fabric I had, no need to make it look fancy since it will never be seen.

Hem the bottom of the front piece

Making a pleat

Mark the center of the front piece.

Measure equal distance from the left and right and create a pleat by folding the fabric and pressing it with your iron, and pin in place. {I had lots of extra fabric, so I did this twice for a double pleat.} Do this equal, left and right.

Pin the pleat together so it stays in place while you sew.

Attaching the pieces

Cut and hem the ends of the front piece. Hem all panels to the side pieces {no need to hem the top}.

Sew right sides together of all sides and the main piece.

The finished crib skirt

Iron everything to make it crisp, and you’re done!