Many pregnant women experience heartburn for several reasons. The increase of hormones during pregnancy causes ligaments to soften, allowing the lower esophageal sphincter to relax at inappropriate times and allow gastric acid to reflux. Changes in the body and baby's development also create more pressure in the stomach, forcing stomach contents into the esophagus. There are steps a pregnant woman can take to lessen heartburn discomfort, such as avoiding trigger foods and drinks like caffeine, eating smaller meals, elevating the head while sleeping, and avoiding tight clothes and smoking.