I got the 3" organic cotton layer crib mattress,and my daughter in-law just called and said it fit like a dream!!!! so if you get the dream on me mini crib 3 in 1 or 4 in 1( it should fit great.) BELIEVE me if it didn't I would be the first on the phone,and would have a fit.If i buy something it should be as advertized.and this was!!Thank you Wayfair!!   Tracy from Elkhart Indiana 

Pros: Fit great
Cons: none