The thing is that co-sleeping is safer, when done properly. Babies heart rates and breathing are regulated by mum, and mum is also very in tune and usually wakes up if the baby stops breathing. Not to mention the convenience of bfing without getting out of bed, which leads to mum getting more sleep, which reduces the risk of car accidents etc.

BUT, not everyone who co-sleeps will do it safely. I think this is why the SIDS foundation recommends not co-sleeping. Because on the law of averages, more babies are probably safe if they don't recommend it, because more people who did it might do it wrong than right otherwise (I hope that makes sense, I don't think I worded it very well). If you are ensuring that bub doesn't overheat or suffocate in a pillow etc, and that you are have not been drinking or taking medications that make you drowsy etc, then you should be fine. It is, after all, the way that babies have slept for hundreds of years, and still do in many parts of the world!