Interesting, Ultramarina. Sure sounds like a PG child with those early milestones. Makes me think though. DS5 who tested PG did have impressive early milestones but nothing like OP or you describe. Advanced, yes, but nothing completely spectacular before 18 months old.

Once he hit 2 he really accelerated and by 3 he was reading at a 4th grade level and doing 1st-2nd grade math. This has continued and he is learning at lightning speed without being taught. It is really like magic.