It probably isn't AS-related as such. There are tremendous normative pressures brought to bear (through the media, in peer-groups and other unspoken mechanisms of 'expectation'), to emit the coo-ing and aaah-ing noises at the sight of a noisy, smelly, incontinent non-person. For reasons that utterly elude me, there seems to be an unspoken expectation on the part of new parents that expects everyone to be as interested in their progeny as they themselves are.
A similar phenomenon can be seen when a recently-engaged young women flourishes a diamond ring that she has just been given as an engagement ring, expectating 'congratulations' and other outpourings of sickly sentiment.
The only way in which it could be remotely connected to AS is through the fact of disobeying the social expectations merely by uttering any dissent at the 'majoritarian' viewpoint.
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"The power of accurate observation is called cynicism by those who have not got it." - George Bernard Shaw (Taken from someone on comp.programming)