Discuss the severity and causes of congenital diaphragmatic hernia in newborns, and provide professional medical advice.

Patients with diaphragmatic hernia should undergo surgery promptly, as severe hernias may lead to internal organs entering the chest cavity. Modern laparoscopic surgery offers many advantages, including the use of patches for repair. Postoperative precautions include reducing food intake, focusing on high-protein, low-fat diets, avoiding high-calorie foods, minimizing post-meal lying down and eating before bedtime; sleeping with the head elevated and feet lower; avoiding behaviors that increase intra-abdominal pressure such as bending over and wearing tight clothing; overweight individuals should lose weight. It is recommended to undergo surgery promptly!