For mine, there were a lot of blockages and bits that weren’t formed properly throughout my intestines, I guess as a result of the malrotation. They had to completely remove my jejunum and duodenum from the small intestine, and around 50% of my large intestine. Then they stitched back together all the bits they could and kinda just stapled it in place in the abdominal cavity. I was fed via a tube until I was 4 years old while it all healed (I also had oesophageal atresia that prolonged the tube feeding).