Origins of the historical shift towards Believers baptism in the Protestant movement?

Much of modern protestantism believes that only believers should be baptized, as believing adults (or at least consenting young people). The primary example being obviously Baptists. This is a marked shift from the early reformers, the two which I am most familiar with being Luther and Calvin. Both of whom did infant / pedo baptisms. ( As well as many modern protestant movements stemming from these reformers) When historically did this idea begin to gain traction among protestant believers? Who were the originators and where/how did it spread? **What I would like in an answer:** A brief (or not so brief) Historical overview of how/when/where this idea originated, gained traction, and eventually spread. **What I hope to avoid.** "The practice of believers baptism is biblical!". Yeah I agree but that really is a different question. "The church has been baptizing infants since the "x"th century!". Sure I acknowledge that but I'm not asking about that. Certainly some explanation of why the originators came to the conclusions they did might be necessary in an answer, but I'm not looking for impassioned arguments for or against types of baptism. I'm pretty well versed in those arguments and have my own opinions.