Thanks ladies. He said it's because allergies are on the increase so the advice on delaying solids til 6 months is thought to not have the affect on lessening allergies as previously thought.
I'd have to see some research on it , particularly starting at 3months old with, as Marie said, the tongue thrust and not being able to sit up properly.
Also even when the recommendation was waiting 6 months, I'd say most parents I knew started at around 4 months (which I have no issue with at all as we all do what is best for our own child, but it makes me question if the research is comparing apples and oranges rather than apples with apples

when they're making statements about allergies being on the increase due to solids being delayed til six months?) It's all very interesting anyway, but I've decided to still wait - she'll be 6 months old in less than a month anyway!
ETA: Sam my SIL did BLW successfully. I'm too chicken to try it though as I'd constantly be hovering and panicking at the first sign of any gagging! So I'll still puree but will try with changing the consistency to mashed sooner than I did with the boys.
Becky I can't remember what goes after the orange foods either. I'd have to look up my little baby food book! I do remember that it's good to introduce a range of veges before trying anything sweet. Babies have a naturally sweet palate and will prefer sweet things so if you introduce sweet things ie. pureed apple etc quickly, they can start to turn up their nose at the veges!