Shrinking, no one suggests that 'everyone' whose baby started early solids has these problems - that would be ridiculous.
Of course people can have different views on the timing of solids, but my views are based on the extensive literature and research on the health impact of early solids, the fact there is no evidence that babies need to have early solids, and the studies showing they make no difference to sleep and settling.
My views have nothing to do with my individual personal experience, nothing to do with any ideology, or instinct, or what my father told me......it's an informed view, if you like.
I think there is almost certainly a range of 'readiness' but 6 mths is a useful age around which to build guidance, knowing, as we do, that 4 mths is probably too soon for most babies, and that 8 mths is probably not soon enough.
Being born 'late' is unlikely to have any impact on gut development - of course you can have a view, tentative or not, that it does, but it's going to remain a 'view' unless you can point to studies that show any different. Even studies that show babies born 'late' develop faster would be a start - but are there any?
Basically, I am saying that people can think, and do, what they like. They can believe the moon is made of green cheese, and they're entitled to that view. But other people on a talk board will come along and talk about that, and bring in evidence to back up their view. Doing so is not 'unbalanced'.