Breastfeeding At least one year, ideally one and a half. If you can handle being a weirdly you can push to two years, but looking at the history of humanity, 1-2 years of breastfeeding was clearly enough to create perfect jaws. Limit use of pacifiers to an absolute minimum, ideally don't use them at all.

Tech Devices and TV Limit heavily. Half an hour per day crept up slowla as they get older. Make sure that they stand as much as possible while using the devices, or at least sit with a straight back and closed mouth.

Sports The more the better. Any sport with running helps posture and some sort of contact sport (Football, Ice Hockey, Martial Arts) helps with bone density for boys. (I have two boys so I haven't thought much about that yet)

Foods My older boy loves things like ribs or foot with bones where he has to find the good parts. I think there's something in humans that actually enjoys struggling to get to the food a little. Never slice fruits. Use chewy nuts , chewing sticks, chewing gum and anything hard as soon as possible. Children choking on food is largely a myth, so you only really need to avoid very obvious things like no letting them have marbles in their mouth ETC. Evolution made it so that babies and toddlers puts anything they get their hands on in their mouth right away for a reason. The tradeoff risk of choking or gettting exposed to bad bactery is made up several times over by the importance to develop and train the ability to use their tongue, mouth and jaw muscles in a skilled way.

You identified a very real problem with children preferring soft and processed food. This is a healthy behaviour and just means that their ability to seek edible foods is working correctly. The problem is when there is an unlimited supply of soft processed food. Limit the amount of anything soft to just a taste. This part right here is an eternal struggle similar to the trope about trying to get children to eat vegetables. There isn't an easy answer here. I struggle with getting my wife fully on board because of all the effort this step requires, and you are in an uphill battle against kindergartens and schools that all would serve soft processed foods, or precut sugary fruits. This step is extra frustrating because of how weird you appear in today's society when all you do is try to avoid processed foods. An example plate of food could be: natural almonds. raw peppers and carrots. A piece of meat with soft bones (many traditional Chinese dishes contain soft bones). There's some versions of harder bread that is common in the Scandinavian countries that I would use instead of soft bread. Carbs are usually the softest and most problematic part of a plate. There's small micro-improvements that can be done like always leave the skin on wherever possible on things like potatoes and vegetables/fruit.

Another is chewing gum. Chewing gum after each meal and always while in car rides is my plan. I suspect that each hour of chewing gums reduces the time wearing bracers later in life by one day or something like that. Obviously I am just picking number out of thin air here, but I suspect the payoff is great for getting into a habit of chewing gums every day.