Girls under three grow back their virginity after sex with their husband

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Source for the rabbi's quote. Girls can marry from aged three in the
Babylonian Talmud, and younger than three if they're marrying a Cohen.
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Some quotes from the Babylonian Talmud on the re-growth of infant girl's hymens:
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Rather the practical difference is the case, for instance, where her husband had intercourse with her while she was under three years of age and found blood and when he had intercourse after the age of three he also found blood. If you grant that the features disappear and reappear again the blood might well be treated as that of virginity, but if you maintain that they cannot be destroyed until after the age of three years, that must be the blood of menstruation.

Niddah Folio 45a

When a grown-up man has intercourse with a little girl it is nothing, for when the girl is less than this (less than three years old), it is as if one puts the finger into the eye... I.e., tears come to the eye again and again, so does virginity come back to the little girl under three years

Kethuboth Folio 11b

Rachel Adler (herself Jewish),  a professor of Modern Jewish Thought & Judaism wrote in 1998:

".. the Torah specifies no minimum age for sex with a girl-child, and the Talmud's minimum age is three. The Talmud prescribes no penalty for intercourse with a girlchild under age three, because it was believed that the hymen would regenerate at that age, and consequently she was considered to have sustained no damage"

Engendering Judaism: An Inclusive Theology and Ethics