We have a Sundvik crib and my cousin gave us her mattress for free.
According to the safety warnings on the crib the length needs to be a minimum of 51 5/8 (even though on Ikea's website it says 52 inches). Which this mattress is.
BUT it is not what I would call snug. I can shift it up or down easily and when I push it to say the bottom of the crib there is about a 1.5 inch gap at the top of the crib.
I think this is too big a gap. Am I right? Online some places say it is, others say it is fine. So I have no idea.
If you have this crib, what mattress do you use?