Hi all!
The brand of crib I have has a non standard mattress size and unfortunately they don't offer water proof mattress protectors. So I started looking elsewhere for other protectors that matched more or less and it occurred to me that I can just buy a large mattress protector (ie the size you'd use for a cot bed) then tuck it in / fold it for use in the crib. What I'm worried about is whether this can increase SIDS risk so should I buy something that more closely matches the crib size? Lullaby trust guidance once says you need a waterproof cover but doesn't say anything about whether it can be larger than the mattress size and then folded.