Find a digestive enzyme for him. It can’t hurt and it might help him to better use the nutrients in his food. People enzymes from the health food store work great, until you have a better idea of exactly what he needs. Probiotics would probably help rebalance his gut flora and heal the damage that all the parasites did. I know you want to put weight on this boy, but be careful to not overfeed as that can cause diarrhea too. Feed for what he should weigh. When you get him on an even keel again, consider rotating foods so that his gut stays healthy. Feeding the same food for too long limits the number of different strains of probiotics that can survive in the intestines.
