I am sure that you have read a lot about OTC which is a rare genetic metabolic disorder. Specifically the damage is done by the child's inborn inability to deal normally with proteins in the body which results in the lethal accumulation of a breakdon product called ammonia. Females are the carriers of this condition and you and your daughter need to be tested for this. It is highly possible that the death of your baby son so early in life many years ago was due to undiagnosed OTC. You need to see a geneticist.
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