There is a somewhat famous minhag for a child to fast the three fasts preceding His/Her Bar/Bas Mitzvah.
Is there any halachic source for doing this, or is it an unnecessary adopted custom?
You have presented a false dichotomy. It could be there is no halachic source for it and it is still a necessary adopted custom. A family or communal custom can be binding on you even if it wasn't documented by a European rabbi a few hundred years ago.
about 1 month ago
According to Dinonline.org, there doesn't seem to be any source for this custom.
Chabad labels this a “persistent myth.”
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