I feel I have to say, that the current thinking on Crohn's and ulcerative colitis is it could caused by MAP, a bacteria that could come from meat, milk and water and the other is it's a genetic problem, much research is taking place
I can find no correllation between early weaning and either disease
The WHO does not say it is dangerous to wean early, it says waiting til 6 months and exclusively breast feeding cannot and will not hurt the baby. But again, this advice is more for BF and not enough research has been done to see what is better for FF babies
The argument that new research can't be done as no one will subject a baby to the early weaning group is not needed, they have the research already, virtually everyone was weaned pre 6 months as little as 12 years ago, so the statistics are already there
If I was a parent of a young baby now, I honestly do not know what I would do. I had a baby that was satisfied by bf til 6 months naturally and one that swiped, chewed and swallowed food at 4 months (developmentally very advanced in everything) I also know that solids did make sleep better in all 4. So far, we have no problems, if we do later....do we blame early weaning or genes or genetics or environment. If I had a baby, I'd probably try to hold on for as long as possible, not follow any timeline and read the signs from the infant