Old hiccups in infants may be caused by improper feeding, indigestion and esophagitis. 1. Improper feeding: due to incorrect breastfeeding posture, not giving the baby timely burping after eating milk, etc., will lead to swallowing a lot of air, which will cause the baby to hiccups or even bloating. 2. Indigestion: because the baby’s gastrointestinal function is relatively fragile, may feed too much milk, resulting in the baby’s gastrointestinal indigestion, there will always be the phenomenon of hiccups. 3. Esophagitis: due to irritation of the esophageal mucosa caused by mucosal congestion and edema, inflammation can also cause esophageal spasm and contraction and esophageal stenosis, when the esophageal spasm is severe, the phenomenon of hiccups will always occur. There are many other causes of hiccups in infants, so it is recommended to take your infant to the pediatrician for examination and treatment according to the cause.