Choosing Veganism for your children

I have certain reservations about fully supporting parents choosing to raise their children as vegans. I have no problem with a vegan lifestyle. I fully support it for those that choose that lifestyle, knowing exactly what it means and entails. Something irks me about the fact that the children arent choosing to be vegans. They don't know what they are not choosing, and the standard diet that they are sacrificing. I am not saying that children wouldnt choose to be vegans, and if they did I say go them, but the parents just choose for them. As I write this I realize that I have said there is no problem with parents picking the standard diet for their children without the children knowingly choosing this diet. I have a cultural bias, stemming from the way it is done in my culture in the past and present. This happens in anthropology all the time as people of certain cultures try to learn about other cultures without a personal cultural bias, but it fails almost always to some degree because every person's culture is such a part of them that it becomes a mental barrier to not judging with bias. I realized, though, that my natural leaning towards the standard diet for children, until they choose a different one, originates from the fact that the standard diet has been working all this time in getting children to grow and reach adulthood. There's a security to the standard diet because of so many years of success, and there are still some doubts that the vegan diet may not be providing all the necessary nutrients kids needs, or at least not comfortably.
Children need more protein than adults, so a parent shouldn't pick a diet for thier child just because of personal beliefs or personal methods. I'm not saying that this is the only reason that Vegan parents choose vegan diets for their kids. I just worry that veganism may make it hard for a child to get all the protein they need. It's easier on the standard diet, most would say, because the vegan lifestyle requires avoidance of certain foods, and extra work to get the right foods.
One last thing that I feel is worth saying is that the extra effort needed to be a vegan and get vegan food means kids have to miss out on certain "fun times" of eating with their friends who are eating a standard diet. They can't eat the spaghetti and meatball dinner that the hosts mom made at the slumber party. This separation is the parents choice, not theirs. Like I said, though, I don't think this makes veganism wrong. I simply want to say that these are thoughts that go through my mind when I pause on the idea of vegan choosen diets for children.