A lot of things contribute to a weak child and future disease. Not only nutrition or "inheritance". Things like the mothers nutrition, exposure to environmental toxins, cooking and household utensils (unless only raw foods are projected), exposure of toxins within the home environment like paints, moldy walls, dust and clean air, then exposure to radiation like cell phones, wifi, then products like shampoo, soaps, washing powder, dishwashing liquid, cleaning liquids, deodorants and much much more are subject to disease in your future offspring. That´s before the child is born. Then after it´s out there are a lot of things to consider as well. Choice of mattress (full of toxins), diapers (full of chemical), clothes (cotton doesn´t mean it´s all safe), toys, foods, carrier bags (for optimal future posture), baby wipes and and and. I didn´t even touch vaccines or meds during and after childbirth. There are a lot of things that can mess up a childs future life. Therefore I doubt that that it´s all about inheritance, some things yes but a lot depends on the childs upbringing and avoidance of toxins.