My 3 week old baby constantly suffers from hiccups daily. what causes them? and how can i prevent them?

Benign variation: Hiccups have been explained as a spontaneous nerve discharge triggering the breathing muscle to tighten in a cycle like a heart beat. Some have suggested the stomach of the newborn rubs the diaphram and triggers the pattern, and that with age the stomach moves away lessening the problem. The most active cases have them before birth. I know of no treatment with any value.