Then I matched all 4 corners and rounded them to make the entire thing oblong.
Lay it over 5 layers of batting
(I did a 2 and a 3 layer cut because my scissors would not go through all 5 layers without pulling the material.)
Cut it TO SIZE- don't add a seam allowance.
Cut 4 layers of muslin also to size.
Then alternate the layers (PATTERN POWER as my 4 year old said)
You will also sew closer to the outside of the seam allowance because this is a 3D mattress, so if you sew it the same size as the inner part- the cover you are making won't fit!
SEE: you will now roll and stuff the inside batting layers into the muslin case.
Don't forget to sew your opening shut
You will dart 5 places to hold the material all together and keep it from shifting.
This was actually the hardest part for me!
And done...now you need a cover to make it pretty and to keep the baby drool off of it.
I don't think this is machine washable, I would recommend hand washing and laying flat to dry, like a duvet.
I will blog about the sham next. I did not have a pattern for that one, so I made it up (and am pretty proud of that actually)