Nuna MIXX Instructions Manual page 74

Mattress
! Always use the mattress when using the bassinet.
Make sure the bottom of the bassinet fabric is securely fastened.
Insert the Mattress into the bassinet so that the opening seam is on the
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bottom.
! Mattress should be completely flush with the
bottom of the bassinet. (21)
The Mattress Cover can be removed
Do not wash the mattress pad.
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and machine washed. Line dry only.
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