Here is a thread that was active last week that has a lot of information in it. The link to the study that I think you are referring to is posted in this thread by MJB:
While I generally agree with your point that you can find anything on the internet to backup anyone's theory, I have to say that as often as parenting styles and what we consider to be "normal" have changed, I think we have to look at new research. I read about the study and it made a lot of sense to me. But, even before I read the study I always found the theories about virgin gut flora to be completely against my intuition. While I think that babies are meant to have mostly mama milk until they are about a year old, I see nothing wrong with tasting and even eating at a very early age. Every baby is different and some respond poorly to food early, but some (like mine) have no problems with it. But, my kid could reach for food, sit up, and had no tounge thrust at 4.5 months.