Daily Ancestornaturalis
Naturalis is Latin for natural; filius naturalis in a parish register usually means a natural child, one born outside marriage.
In parish registers filius or filia naturalis usually marks a child born to unmarried parents, like illegitimus. In older classical use naturalis could also mean a person's own child by birth, even a legitimate one.
Because of that, read the whole phrase. If the entry adds legitimus or names a married couple, naturalis simply means born of their bodies. If only the mother is named, the child was most likely born outside marriage.
As seen in a recordLatin baptism register, 1810s
Franciscus, filius naturalis Annae Huber, ancillae
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Daily Ancestor. "naturalis." Dictionary of Old Record Words. https://dailyancestor.com/dictionary/latin/naturalis. Last checked 2026-10-10.