ETA - Jen MCHN's are now telling mum's that solids can be introduced between 4 - 6 months. Studies have shown that the longer you leave giving your child solids the higher the potential that they will have allergies?? (apparently)
The WHO hasn't changed its guidelines, it still recommends exclusive bfing for 6 mths and the introduction of other foods after this time. MCHNs are notorious for changing their advice, depending on who you get and where you are. But the international health organisation hasn't moved on this one. Discussion will always abound on this!