I thought some here might find this interesting. It's a thread on a blog I read (Feminist Mormon Housewives) about a woman being asked to cover up or leave her church meeting.
One thing I found interesting in the comments: there is a lot of hostility toward moms for breastfeeding in public (as well as a lot of support for it), but virtually no mention of bottlefeeding or formula. I think it supports my view of that the norm in the communities I'm most familiar with is this: "Breastfeed, of course! But you'd better do it in private."