**1. Introduction**

The prevalence of congenital heart disease (CHD) is known to be approximately 0.5–0.8% in all live births [1]. It is estimated that approximately 30–35% of children with CHD require medical treatment, interventional procedures, or surgical treatment [2]. Over the last 30 years, significant advances in surgical techniques and medical treatment have been made in the treatment of CHD in the world [3]. Nutritional status of CHD patients in the first year has an important role in growth and neurodevelopmental functions. GERD, which is closely related to nutrition and malnutrition, should be considered in these patients [4].

Gastroesophageal reflux is a common condition in children in all age groups, with gastric contents retrograde passage to the esophagus, even pharynx and mouth. This condition is defined as gastroesophageal reflux disease (GERD) if it continues more frequently and continuously and causes worrisome symptoms and undesirable consequences [5]. Especially, it results in esophagitis or other esophageal symptoms or symptoms of the respiratory system.
