At the risk of being obnoxious, I'm curious what, if any, very early signs of giftedness you observed in your kids?
My husband and are both high IQ, and we have a three month old baby girl. We assumed she'd be bright, and it is occurring to us now that she may be extra bright? ;)
She has always been very alert, and more wakeful than other babies her age. She has been able to roll over for at least 6 weeks now, can support her own weight while standing (though not balance) since before two months, and can pull herself to sitting (but needs a little support maintaining the posture).
She enjoys reading books with me, when we sing she "joins" and she coos and gurgles in conversation (I speak, she responds, and so on). She doesn't cry to get our attention, she uses her "intense voice" as we call it! ;)
She has been able to track and grasp objects for some time as well.
Those are the things that come to mind that people have told me are out of the ordinary. Go ahead ladies, tell me I'm just a doting mom that thinks her little girl is exceptional, I can take it. :) I figure you have the value of experience! I will continue to be impressed by her regardless. :)