However if you are trying to cover a mattress that is a certain size the dimensions of your quilt will become less loosey goosey and should remain relatively standard.
Baby bed quilt size.
The standard crib quit size is 36 x 52 or 30 x 40 for small baby cribs.
Most baby mattresses are 52 inches by 27 inches so your quilt should fit comfortably into the crib.
Most standard crib quilts are rectangular measuring about 52 inches by 34 inches.
A big quilt of 45 inch by 60 inch is a good size which will hold for many years even after the baby has grown.
Baby baby quilts are typically square in shape and range from 36 inches 91cm by 36 inches 91cm up to 52 inches 132cm by 52 inches 132cm.
Just because a crib quilt is usually 36 x 52 does not mean that you have to make all of your baby quilts fit that shape.
If you are using a pattern for your baby quilt follow those instructions.
The sizes mentioned for the baby blankets below are applicable for baby quilts as well.
Crib mattresses can be 23 x 46 but some mattresses can be 32 x 66.
And in the case of a little baby crib the mattress size is 27 x 52 so a pre cut package of 45 x 60 batting should work for most crib quilting projects.
The baby quilt size is best left to your interpretation using your own judgment and approximations.
Either one or any measurement in between will be big enough to keep baby snugly warm on even the coldest winter day.
These sizes are approximate and can vary 4 8.