Seriously, if your thinking about starting BEFORE 6 months because they are 'ready' just wait. It's only a couple/few more weeks. Those few weeks really do make a HUGE difference to how ready they are INSIDE. Their digestive tracks aren't ready for food so early...
I don't necessarily agree with that statement but each to their own of course.... we started DD at nearly 5.5mths and she took to the food really, really well... she didnt get constipated like some babies do when they're digestive system isn't ready and really loved it from the start. So it depends on each baby..... some babies are ready a bit earlier than others. It's trial and error as to when to start. If DD wasn't taking the food well and had become constipated or diarrhoea etc for example, then I would have considered stopping and starting again 2 weeks later but this was not the case for us.
I don't think 2 weeks would make a huge difference to many babies. JMO.