What are the causes acidity in kids There are a couple of main reasons kids can experience acidity, which is often related to Gastroesophageal Reflux Disease (GERD). Here's a breakdown of the causes: Immature Digestive System: In babies younger than roughly 10 months, their Lower Esophageal Sphincter (LES) - the muscle that keeps stomach acid down - isn't fully developed yet. This can cause stomach contents to back up into the esophagus, leading to discomfort. Diet and Lifestyle: Certain foods or drinks can irritate the stomach lining and trigger reflux in children of all ages. This includes things like fatty or spicy foods, citrus fruits, caffeine, and carbonated drinks. Overeating, frequent heavy meals, and even obesity can also contribute to acidity. Other Factors: Occasionally, other factors can play a role. Viral infections, reactions to certain medications, or a hiatal hernia (when part of the stomach pushes through the diaphragm) can also cause reflux in children. Diet and Lifestyle: Certain foods or drinks can irritate a child's stomach and trigger reflux. This includes: Large meals Overeating Caffeinated drinks Carbonated beverages Spicy or acidic foods Other Factors: There can be other contributors to GERD in kids, such as: Obesity or being overweight can put pressure on the abdomen. Certain medications like asthma medicines or antibiotics. Smoking or secondhand smoke exposure can relax the LES. Hiatal hernia: When part of the stomach pushes up through the diaphragm.