I wouldn't be too quick to identify an unknown hitchhiker snail as X. I have a wide variety of very small snails in my tank, in various shapes, sizes and colours, and they haven't grown at all. Unless the babies grow into the actual animal you believe they are, they probably aren't that. There are a bajillion types of snails, as evidenced by the list on http://www.gastropods.com.
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-Quinn
Man, n. ...His chief occupation is extermination of other animals and his own species, which, however, multiplies with such insistent rapidity as to infest the whole habitable earth, and Canada. - A. Bierce, Devil's Dictionary, 1906
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