Are there any non-surgical treatments available for congenital diaphragmatic hernias?

Requires surgery. Surgery is required to treat congenital diaphragmatic hernias. The surgery occurs either through a scope that the surgeon inserts into the body or after an incision is made in order for the surgeon to visualize the area to repair. A few highly specialized centers may offer experimental fetal interventions. One example of this is balloon tracheal occlusion.
No. These type of hernias can be very serious. They are surgical problems. Anyone who suggests otherwise is wrong. There is an old saying which goes "the treatment of a surgical disease is surgery". This applies here.