Killing baby Hitler would not solve the systemic problems in Germany that lead to a despot seizing power, nor the conditions that lead to persecution of Jews and other minorities. (Jews in Germany were 2% of the population and owned 50% of the personal wealth; it was Anti-fa's & any academic bubble communist's much lauded "class warfare").
Killing Baby Hitler would also be a bad idea:
While we all know Hitler did nothing wrong, imagine if the 3rd Reich had been helmed by who had a better grasp of what they were doing and didn't make any of Hilter's tactical mistakes?
And even if you did want to simply stop Hitler from taking power: Everyone wants to kill Hitler. No one wants to find 25 year old Adolf and get him a job as an architect.
Edit:
Or as a Science Fiction writer.