Whoa, I had no idea that killing Hitler was such a big topic of time travel genres (books and movies). What comes to mind for me is the recent short film Kung Fury where a time traveling kung fu master cop goes back in time to kill Hitler (I've posted the video below).
But yeah, I had no idea that killing baby Hitler was such a hot topic of debate -- I just assumed most reasonable people would immediately say 'yes' when asked the question. But now, after watching the Vox video above, maybe that's not the best thing to do for all of the impossible-to-imagine after-effects that might cause.
If you want to read more, author James Gleick has written a book about it called Time Travel: A History.