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When she regenerated from Mels in "Let's Kill Hitler" would be the best guess, because that's when she 'takes on' the name. But from a technical stand-point she 'meets' him as a child in "The Impossible Astronaut".

Also, a flesh replica of Melody Pond (aka River Song) who was mentally linked to the real Melody met the Doctor as a baby on Demon's Run in "A Good Man Goes to War".