I would think developing acid reflux after a pregnancy isn't totally out of the ordinary but I'm not a medical professional! Acid reflux is extremely common in pregnancy. All of your organs, including your stomach, are displaced because of the uterus enlarging.
Acid Reflux During Pregnancy: Causes and Treatments.
Gastroesophageal reflux disease (GERD) occurs in up to 50 percent of pregnant women. Whether you are pregnant or not, GERD can occur when there is an increase or decrease in pressure on different parts of your esophagus and abdomen.
Acid reflux is when stomach acid gets pushed up into the esophagus, which is the tube that carries food and drink from the mouth to the stomach. Some reflux is totally normal and harmless, usually causing no symptoms. But when it happens too often, it burns the inside of the esophagus.