And yes, it's sad ... tails usually form as a birth defect, a deformity of the spine called spina bifida. And in these situations, doctors will surgically remove the tail with no harm to the baby.
The actor expresses interest in seeing earlier portions of Tails' life shown on-screen, opening the door for a "baby Tails" depiction of the character. Check out O'Shaughnessey's comment below ...
An origin story for Tails would be amazing, to see where he came from… a little baby Tails. "Is it of course amazing to have him with Sonic? For sure, because they are, you know, a sidekick/hero ...