Yeah, and I bet all the studies about how unhealthy milkfat is are sponsored by the soya industry. Whatever. I thought this was the "Traditional Foods" forum, not the "Vegetarian and Vegan" forum?
Anyway, OP, how old is your son? My response would vary greatly based on that info. You said he weaned two years ago, so he's clearly older than 2
but, given that this is MDC, I'm assuming he's older than 3 and possibly older than 4?
In any case, I think it's a rare child who *needs* milk, or replacement milks. If he is younger than three, I'd be concerned about getting fat and cholesterol into him. I'd be feeding him liver and fatty meats and egg yolks, cod liver oil and, if he can tolerate it, butter oil. I would use coconut milk in smoothies and maybe make homemade coconut milk ice cream or yogurt. Between about 3 and five, I'd try to get some of those things in sometimes, but I wouldn't consider it as critical. Over five? As long as he's eating a decent amount of healthy fats and nutrient-rich foods, I wouldn't worry about it at all.
It's obvious that human milk is for human babies until they're old enough to wean; after that, no milk is neccisary. That doesn't mean it's not valuable. It is a highly concentrated source of nutrition, and as such it's very economically valuable for those who can tolerate it. But, it's not biologically *neccisary*. It's most valuable when a child weans early and still requires the fats and cholesterol to build his brain. The same value can be had from other sources (liver, egg yolks, CLO), but it's far easier to get a couple glasses of milk into a 2 year old...
Whether your child weaned at 1 or 4, if he's past the age when most (and I'm talking worldwide most, not US average "most") children wean, he doesn't need milk. At such an age, if he still wants it for emotional reasons (and, as I've been trying to cut gluten out of my diet entirely, I can attest that social/emotional attachments to food are tremendously influential), I would try homemade almond milk, or maybe coconut milk watered down with coconut water.