Hello, I have gone through your query and understood the concern. I will be able to comment better if you can provide me details of the autopsy and the biopsy reports. Several factors like genetic defects, congenital malformations, hormonal insufficiency, infections, uterine anomalies, trauma and so on are responsible for an abortion. A complete evaluation by a specialist in high risk pregnancy is necessary to prevent future complications. I would suggest Dr. Kamini Rao for future reference as you wanted some suggestion. Hope this helps.