Heartburn can be a problem during pregnancy. Your hormones relax the ring of muscle at the bottom of your esophagus that keeps the food in your stomach. The food rises into the esophagus and gives you heartburn. Once this ring of muscle, or sphincter, is relaxed, heartburn is more common. Also as the baby and uterus enlarge during the last trimester, they will displace your stomach, leading to the food coming back up into your esophagus.
You can temporarily neutralize the heartburn with antacid calcium carbonate pills. Just drinking any form of liquid will help reduce the acid coming out of your stomach. Probiotics, the beneficial bacteria in yogurt, can help protect your stomach and esophagus from heartburn. Avoid eating high fat foods that are difficult to digest. Another solution is to avoid foods high in acid such as vinegar, soda pop and lemons. Sleep on your left side with your head elevated if you have heartburn in the middle of the night.