Nature / nurture
An 'argument' doomed to futility.. can one say inextricably entwined ? But here's a brief example I think correlates with your experience:
At supermarket checkout line. Baby in a cart facing me, as mom unloads stuff onto the conveyor. His? her eyes were luminous (to me, and to a friend with me). We had about a 2 minute 'conversation', this infant and I! Her eyes followed me and I made facial gestures. She laughed, made her own. Became almost pensive at a few points, before resuming the exchange - which I believe entirely possible ('pensive' that is) from the womb on. I exaggerate only slightly in suggesting that she appeared to personify some sort of Buddha-child (as was D's take on the play, also). We both spoke to the mother eventually - and she just smiled. Other people around, noticed this child's unusual 'presence'.
Extraordinary event, 'least in my lexicon - but it is about what's possible and not the imagined norm. There are other stories of similar ilk - one I recall re a baby speaking quite early, even to saying in pretty good English, "mommy I want some milk". Again - prodigy but.. enough to debunk lots of generalizations we make about 'infant consciousness' IMO.
Cheers,
Ashton