I haven't posted any of him, and ask friends and family not to post any pictures with him in them, even if they're pretty sure their Facebook/Instagram/whatever settings would keep it from getting around. Once I think he's able to understand what the internet is and the ironic permanence of things you later wish would go away (and the fleeting nature of things you'd love to see again in a few years), he can start making his own choices.

However, I'm not going to judge parents who post normal, happy, non-embarrassing kid pictures sometimes. He might end up standing out as a bit of an oddball for not having any publicly-available pictures from his childhood.