That is something that has always bothered me about that episode, nobody, even Celestia and Luna, was expected that the baby of the alicorn Princess Cadence was a alicorn, understand that for many fans knew that as Cadence was not always a alicorn, but the one who had a baby being a alicorn, is an OBVIOUS explanation of why Flurry Hearth was born as alicorn.



In addition, I seem to be the only one, who would know that Cadence would have a baby alicorn very much before it was cannon