I have seen lots of natural twin births in the hospital! Also lots requiring interventions. It is for sure riskier for baby B as once A is born your uterus changes dramatically which could lead to either Abruption or malposition or cord issues, which is why people typically deliver in the OR- but keep in mind that is just for pushing out the babies- not for all the laboring. Yes, twins are certainly born at home. I personally would see twins as a valid reason to change to a hospital birth, I think it is clearly riskier for babies, but also every one has their own tolerance and beliefs around risk so I wouldn't say that someone who chose to do it at home was "wrong." It's all relative and very personal, and depends on your local hospital. Don't gear up for a "fight" but certainly make your priorities clear and learn about everyone's polices, procedures, comfort levels, etc. like, some will do a breech baby B vaginally, others would never think of it. Some require you have an epidural catheter in place, even if it's not hooked up to anything. Just within my community it is all over the place.