Is there any benefit in testing a child to be gifted at a young age?
IMHO, there's no benefit to testing (in general, not just IQ) unless the results of that test would change something.
We considered testing DD7 at not-quite-3, because a high-enough result would have gotten her admission to one of the preschools we were considering. Since we decided that the school was not a good fit for her at that point, there was nothing that would change based on test results, so we didn't test.
She's currently halfway through proficiency testing for a grade skip, and we had her tested using the school's test, because the results of that test (and no other) would change whether she was allowed to skip. We considered IQ testing (mostly because the IOWA manual has a mandatory FSIQ component that figures into the decision-making process) - but based on genes and observation, I knew she was at least 1SD up (enough to pass the "dealbreaker" guidelines), and even giving her a 0 or 2 for the IQ component, she had a high enough score for recommending acceleration. An IQ score wouldn't have changed our decision (or had any effect on the school, one way or another), so we didn't test.
