The claim that Hitler ended child prostitution is mostly false because while the Nazi regime imposed strict controls and persecuted sex workers, including shutting down some visible prostitution venues, there is no credible evidence that child prostitution was eradicated; in fact, prostitution persisted in various forms and was sometimes instrumentalized by the regime.
Did Hitler end child prostitution?

Puffkommandos: The Instrumentalization of Gender in Concentration Camp Brothels - Department of History
Source: history.princeton.edu
Key Evidence
Nazi authorities banned visible prostitution but tolerated or controlled brothels for military or ideological purposes.
history.princeton.eduhistory.princeton.eduPuffkommandos: The Instrumentalization of Gender in Concentration Camp Brothels
muse.jhu.edumuse.jhu.eduProject MUSE
Child prostitution existed before and during the Nazi era but was not systematically eliminated by Nazi policies.
reddit.comreddit.com[Mature Content] r/AskAGerman on Reddit: Did the Weimar Republic have child...
reddit.comreddit.comr/AskHistorians on Reddit: "Weimar Berlin had some issues with child brothels...
Nazi propaganda often distorted facts about prostitution to serve antisemitic narratives rather than reflecting actual policy outcomes.
researchgate.netresearchgate.netBacklash against Prostitutes' Rights: Origins and Dynamics of Nazi Prostitution...
reddit.comreddit.comr/AskHistorians on Reddit: "Weimar Berlin had some issues with child brothels...
What the Evidence Shows
Historical research and scholarly sources indicate that the Nazi regime had a complex and contradictory approach to prostitution. They officially banned prostitution and sought to control it tightly, motivated by ideological concerns about racial purity and public health. However, prostitution did not disappear under Hitler's rule. Instead, it was often driven underground or repurposed for state interests, such as brothels for soldiers or concentration camp prisoners.history.princeton.eduhistory.princeton.eduPuffkommandos: The Instrumentalization of Gender in Concentration Camp Brothels
muse.jhu.edumuse.jhu.eduProject MUSE+1 more
Regarding child prostitution specifically, there is no reliable evidence that the Nazi government systematically ended it. Discussions about child brothels in Weimar Germany are often entangled with Nazi propaganda narratives blaming Jews and other groups for social problems.researchgate.netresearchgate.netBacklash against Prostitutes' Rights: Origins and Dynamics of Nazi Prostitution...
reddit.comreddit.comr/AskHistorians on Reddit: "Weimar Berlin had some issues with child brothels... Contemporary historians and community discussions highlight that child exploitation was a social issue before and during the Nazi era but was not effectively eradicated by the regime.+1 more
Moreover, sex workers were persecuted under Nazi rule, but this persecution did not equate to a successful campaign against all forms of prostitution or child exploitation.theguardian.comtheguardian.comHamburg’s sex workers persecuted under Hitler to be commemorated The persistence of sex work in places like Hamburg despite official bans illustrates the limits of Nazi policies in this area.
In summary, while the Nazis imposed harsh measures on prostitution and used it for their own purposes, the idea that Hitler ended child prostitution is not supported by credible historical evidence.