I've recently become vegan after 30 years of being a meat eater and self confessed cheese addict! My 2 year old has pretty much been vegan by default other than the odd fish finger and a tonne of cows milk for 6 months after I stopped BF before I educated myself of nutrition! 
Im finding the constant remarks about vegan diets exhausting. MIL is now suggesting my son may have an iron deficiency (he put a book in his mouth and she googled it!) and someone else just told me that not giving him chocolate is bad because their immune system can't develop! I mean come on.. no one cares about whether the milk guzzling / McDonald's eating kid is malnourished so why are they questioning my LOs diet! (He's perfect weight for his height btw). Has anyone else had experience with this raising their kids vegan?