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I feel like I need to trust my maternal instinct and parent him on the assumption that he may be GT, rather than waiting around till he's school-aged for someone to test him, kwim?

Definitely trust your maternal instinct and if he seems to enjoy the Science Center at 6 months, keep taking him, even if you get blank stares or the "are you crazy?" looks from other parents. As for waiting until he's school-aged for someone to test him, I've found the school personnel have misinterpreted DD6's results on a couple of tests. If I hadn't trusted my maternal instincts, I would have just accepted their version of the results. Instead, I started researching and asking questions which led me to discover mistakes that affect not just my child, but other children too. Glad you're here and I wish I'd found this board when my children were as young as your son is!