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I really liked the director's cut, but did not realize the theatrical version ended differently. In the version I saw, the womb was the only memory he could trigger to allow him to change it. He has to have access to a memory (a trigger, like his notebook, or - in the end - the video of his birth) and once he goes back, he can act with the intelligence of an adult
Note that he can only change the blackout portions of his life, and that his unique gift is probably why they were blackouts for him -- they are undetermined and changeable events, so it only makes sense he can't remember them.
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