HAHAHA, jesus dude. No, all of that is wrong.

Malnutrition is not a risk, vegan's have less deficiencies on average.

Vegans grow up stronger, taller, and healthier.

Carnists imposing their beliefs on kids and making them eat animals causes tangible negative health outcomes, accelerates the destruction of our planet, is and is ethically vile.

Ridiculously false. All dietary groups have risks of nutrient deficiencies that need to be taken into account. Every diet needs proper planning, or do you actually think the standard western dino nuggets, frozen fries, mac and cheese, and fast food burgers, that too many parents default to, doesn't pose a nutrient deficiency risk? From the linked systematic review:

We conclude that there are dietary inadequacies in all dietary groups. In people following self-selected plant-based diets, especially vegan diets, intake, and status of certain nutrients is lower compared to meat-containing diets, with an increased risk of inadequacy for vitamin B12, vitamin D, EPA, DHA, calcium, iron (particularly in women), zinc and iodine. Of these nutrients, also meat-eaters were found to be at risk of inadequate vitamin D and calcium intake. On the other hand, people following plant-based diets, particularly vegan diets, had higher intakes of PUFA, ALA, fiber, folate, vitamin E and magnesium, which were found to be at risk of inadequacy among meat-eaters. Additionally, the intake of vitamin B1, B6 and C was considerably higher, especially in vegans.

Our results show the need for additional public health strategies to help consumers transitioning to a more nutritionally balanced and sustainable diet by education on diverse nutrient-dense plant foods, food fortification and possibly supplementation.

And here are a collection of statements from leading nutrition authorities from several countries. Just one for example:

It is the position of the Academy of Nutrition and Dietetics that appropriately planned vegetarian, including vegan, diets are healthful, nutritionally adequate, and may provide health benefits for the prevention and treatment of certain diseases. These diets are appropriate for all stages of the life cycle, including pregnancy, lactation, infancy, childhood, adolescence, older adulthood, and for athletes. Plant-based diets are more environmentally sustainable than diets rich in animal products because they use fewer natural resources and are associated with much less environmental damage.

Of any nutrient that vegans might be at risk of deficiency of, protein is virtually never one of them. It is entirely feasible, easy even, to get more than enough protein on a plant-based diet - even for people who do strength training. From Christopher Gardner, who specializes on the subject:

Does it matter if you get your protein by consuming plants or meat?

Gardner: In terms of meeting your protein requirement, it really doesn't. Protein contains the same 20 amino acids, regardless of where it comes from. It isn't the amount of protein consumed as much as the proportions of amino acids, which make up proteins, that matter most. Meat and animal products have amino acid proportions that align perfectly with human needs. Plants aren't aligned as perfectly, but they're really close - so much so that it doesn't matter if there isn't any meat in your diet. You can still get the needed proportions of amino acids from plants. A lot of people think that plants don't have enough total protein to meet human requirements. But the truth is vegetarians and vegans usually meet and exceed their protein requirement as long as they're eating a reasonable variety of foods.

Now let's talk about this idea of "imposing beliefs on your child." In the first place, what a ridiculous notion, every parent imposes their beliefs on their children. What's relevant is whose beliefs are better, which ones cause less harm. You speak of informed consent; then given how often children react with shock and sadness when they find out meat comes from animals, doesn't it make sense to at least wait until they're old enough to comprehend where their food comes from, and everything that happens to animals before feeding them products that come from animals? Would you feel comfortable showing your child a documentary like Dominion?

And going back to the point about health, I already established that plant-based diets are entirely adequate for all stages of life, including pregnancy and childhood. What about the typical western diets? Heart disease can start as early as the womb, and often does start as early as childhood. Plant-based diets generally don't have that problem.

As long as a parent is taking basic steps to enure adequate nutrition, vegan diets for kids are a great choice with lots of benefits. It's the typical western diet that is abusive.

IMO those people need to chill. I used to catch shit from my in laws for never feeding my kids meat, but they're both healthy, strong and they surpass all of their growth and development milestones. Their pediatrician is more than happy with us excluding meat from their diet.

Can you fuck a kid up on a vegetarian or vegan diet? Of course if you don't know what you're doing and you feed them nothing but raw fruit or something. I'd argue it's even easier to fuck them up on a standard American diet. Don't take your kids to McDonald's every other day and tell me I'm a shit parent for not feeding meat to mine. (Obviously this last point isn't directed specifically at you, but at the attitude in general).

Well, vegans have 25% lower risk of CVD and 20% lower incidence of cancer so not being vegan would harm them long term. But not really about that, I take issue how you’re framing this as a personal choice. Think you’re forgetting about someone.

Contributing to animal suffering is a choice I hope they never make just like any other violent act. Just like they won’t be sat down at puberty and told they’re now old enough to decide if they want to rape or not, exploiting animals won’t be presented as a neutral choice either.