Could a diaphragmatic hernia be caused by trauma while in the womb?

No: A congenital diaphragmatic hernia seen in a newborn baby occurs as an anomaly of the diaphragm in the fetus; a congenital hole occurs in the diaphragm, and some of the abdominal organs develop instead in the chest making it difficult for the lungs to develop normally. A traumatic diaphragmatic hernia can occur in a child or adult after birth with severe blunt or penetrating abdominal trauma.