I would like to add something very important while going through the first few days of food removal/diet overhaul.. Small amounts of carbs, maybe fruits are important so that the child doesn't completely have sugar detox symptoms like nausea. I say small because the whole idea is that they don't fill up on these foods. This is another reason milk is great as it has lactose (sugar).

Would you consider a fecal transplant for him? Being aware though...with the interest in eugenics...that you can alter your child. For example a mom chose her daughter ( keep it in the family ) - mom was slim and daughter was large after the fecal transplant mom also became obese.

Hiya. You're breastfeeding a baby, is that right? Could you, as well as sourcing raw milk, pump breastmilk to give to your son? Or would this be difficult, to produce enough for your nursing child and for your son. Well done on the hamburgers! You're making great progress.

If he could eat high meat that would be very healing.