1. Causes of baby hiccups Baby hiccups are caused by gas accumulation in the gastrointestinal tract and are common in newborns and babies under 3 months old. Hiccups can be relieved by farting or vomiting. 2. How to prevent your baby from hiccups 1. Avoid feeding too fast or too slowly, and master the rhythm of feeding. 2. Shake the bottle well before each feeding to fully dissolve the milk powder. 3. Keep the baby in an upright position when feeding to prevent air from entering the gastrointestinal tract. 4. Pat the baby after feeding to help expel gas in the stomach. three,