[bumby]

The problem is it leaves the entire interpretation of what is or is not a distraction up to the mother. The founder obviously thought the baby was being distracting enough to (politely) ask her to step outside.

I've been at professional events with infants; as long as the infant was quiet there's no issue. But I think the it's also reasonable to defer to the attendees who also deserve a professional environment free of distractions. It's hard to know without all the details, but the author must have felt there was some distraction, or I doubt she would have moved to the back to begin with.