company store sheet doesn't fit!

[anutalp]

I've got 3 crib sheets from Company store. 2 of them don't fit my mattress. I purchased the mattress in USAbaby - it's 2 sided (one for infants and one for later with coils). One sheet does fit. It seems to be really strange. I always thought that all the sheets supposed to be standard size. I've got some from PBK and they fit very tightly I afraid that if I'll wash it they will shrink and will not fit.

Do you have an experience with this mattress? Which sheets might fit it? Will PBK accept the sheets after washing if they'll shrink?

Thanks in advance,
Ana.

[anutalp]

I just checked the mattress - it's Kolcraft 2 sided for infant till 20 pounds and for toddler from 20 pounds - dimensions 27 1/4 * 51 5/8.
Thanks.

[Momof3Labs]

What brand is the mattress?

Our Company Store flannel fitted sheets fit our Colgate 2-sided foam mattress quite well, even after many washings.

[anutalp]

Please see above.
Thanks.