Because the Link from this presumed game is the same Link from OoT. The Link from OoT didn't recieve the triforce until he pulled the master sword and Ganondorf took the triforce. There's nothing wrong with Link as a baby having the triforce EXCEPT that OoT shows us that he didn't get it until the events during the first opening of the door of time. Because of this its IMPOSSIBLE for Link to have the triforce as a baby.

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