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There is a belief that if one did not make a kiddush for the birth of his daughter and that girl is having a hard time finding a shidduch, then they should make a kiddush and it will help.

I know from a halachic standpoint there isn't any obligation to make a kiddush, so where did this idea come from?

The Rav of Congregation Ahavas Israel, Passaic, NJ debunks the legend about this story here (edited).

So the idea is a made-up story.

Rabbi Yaakov Yisrael Kanievsky, known as The Steipler (1899–1985) was
reported to have told a father of a woman who was having difficulty in
finding a shidduch that the reason she was experiencing such
difficulty was the fact that upon her birth her father failed to make
a kiddush in her honor. As brochos are traditionally bestowed upon
the new born baby girl for her to grow and marry at the kiddush, since
the father did not have a kiddush in her honor no brochus were
bestowed and therefore she is now suffering with not finding her
‘bashert’.

This Shtetl Legend appears in Jewish story books and I myself was
present at a Kiddush where a Rabbi related the story.

In the Sefer Derech Sicha (volume one page 33) - a compilation of
Torah thoughts by Rav Chaim Kanievsky Shlita (the ONLY son of Rabbi
Yaakov Yisrael Kanievsky Zt”l) it is related that when he was told of
this ‘quote’ from his father he responded: “Who made this up? Wouldn’t
I have heard about it?! He never said to make a kiddush in our
family.”

I myself asked Rav Chaim about this Shtetl Legend quoted in the name
of his father and he debunked it to me as well while adding, “perhaps
for the first daughter you could (if you want) make a Kiddush)
however, there is no obligation to make a Kiddush for a daughter at
all and my father never said there was.”

Ron Yitzchok Eisenman, Rabbi, Congregation Ahavas Israel, Passaic, NJ

Text of Derech Sicha: