So the basic conclusion of this study is 'The evidence surrounding veganism appears to be mixed'. And further 'Overall, veganism is healthier than an omnivorous

So the basic conclusion of this study is 'The evidence surrounding veganism appears to be mixed'. And further 'Overall, veganism is healthier than an omnivorous diet with respect to chronic diseases'. Did you manage to read these parts? With respect to B12 it seems that there is clearly good evidence for vegans to take a supplement. With regards to pregnant and nursing women the evidence seemed a bit less clear. There doesn't seem to be any mention of actual problems with vegan children, only correlations between them and children that did have problems. Despite the uncertainly It certain seems good enough evidence to take b12 supplement for vegans. So the takeaway I get from this is that (Vegan diet + b12/multivitamin) >> Omnivorous diet