There's clearly absolutely no definition of gifted on this thread, so talking about a two year old who was later considered gifted because once during infants they happened to be one of the strongest few kids in a low performing class, is going to be quite different to other kids with much less common abilities.
The real thing is though, to just stop labelling kids full stop, all kids have needs, all kids have advantages, identifying the needs, identifying the advantages are the right thing to do. Labelling them a single label like gifted or even multiple labels like 2E, are not helpful at all, especially if you then go on to make assertions about what people with such labels might experience.
Even things like "taught themselves to read" is problematical, look at the statement above Ds has just turned two and taught himself to read some months ago. He recognises over 100 words
Someone who can read can read most words (in their orthography and vocabulary) recognising 100 words is something quite different, a useful skill of course, but no help at all if you say "can read at 2", the terms are just not well enough defined.
It's also common that people assume certain things are required to be gifted, you need to have a thirst for facts, you need to have a love of learning, they need to be doing the simple skills of school early, and if they don't have those things they some how don't qualify for being gifted.
But of course you also have it the other way, Warrick's
if they aren't reading Dahl or Lewis to you in that first year of school (and “getting” it) then you aren’t probably into the “blimey - this is a bit unusual” camp just yet
Strikes me as both ways, the technical skill of reading is often attained in the first year of school, and I've always been astonished that so many people find these books a struggle to understand, but clearly it's not a sufficient requirement for being gifted. Equally though it's not a negative if they aren't doing it as others have said, they simply might not be interested.