You asked if it rang a bell and how to prepare for a possible IQ, and after raising three gifted kids, I'd have to say that only time will tell. My kid who achieved milestones the earliest and seemed the most gifted as a toddler is probably the lowest IQ of the three - although still obviously gifted. The one who missed most of his milestones and still hasn't managed to register a valid IQ likely has the highest if we can ever measure it.

So keep track of them (it will matter to committees when you're asking for testing/services) and just enjoy your kiddo.