Now that we are parents I think we are treated somewhat differently by people we know who have been parents for a while. We have joined the club, as it were, and are going through the same joys and challenges they had. No matter how good you were with their kids, until you have a child of your own you're still a bit of an outsider.
Of course, you're still a newbie yourself when you have a newborn, and while the more experienced parents can relate to what you're facing (the feedings, the diaper changes, the interrupted sleep, etc.) there's still that hint of finding your worried responses to what are ultimately common things babies go through (the crying, the odd noises, the fussy moments, etc.) to be quaint.