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Though some crib mattresses vary slightly in length and width, the majority of mattresses on the market are manufactured to a standard size that corresponds to standard-sized cribs.
http://www.ehow.com/facts_5784658_standard-crib-ma...
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A standard queen size bed has a length of 80 inches and a width of 60 inches. In comparison, it is 6 inches wider and 5 inches longer than a full-size bed. A queen has the same length
http://www.ehow.com/info_8068257_standard-queen-ma...
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You are right, standard crib mattress size has a little bit of wiggle room. You'll find that there is slight variation in length and width. The depth of the crib mattress can vary
http://baby.about.com/od/sleep/f/What-Is-The-Stand...
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