Cricket - you sound like you know what you're doing, more than the advisor does!

Some things to counter what was said -
* having a baby in hospital increases the risk of it and you dying (birth at home is safer - there is lots of research to show this!),
* the baby gets oxygen just fine from the placenta until it is delivered and will *then* take a breath (google something like "physiological third stage" to read up on this),
* midwives are amazingly skilled in normal birth which, unless you are for some reason high risk, yours should be,
* the more babies you have the fewer complications you have (because post partum haemorrhage risks are lower for you rather than higher as your NP may assume),
* your babies certainly haven't been big (women regularly birth bubs at 10lb and more - one woman in Tasmania birthed a 14lb one a few months ago, vaginally!),
* the reason women moved from home to hospitals are many and varied and had NOTHING to do with safety, and
* you are amazing and fantastic and completely able to birth this bub just like you did its sisters!!!!