How to Prevent Colds in Late Pregnancy In the third trimester of pregnancy, pregnant women’s body resistance will decrease, and the risk of colds will also increase. Therefore, preventing colds has become particularly important. The following are several effective preventive measures: 1. Strengthen exercise. Proper exercise can help enhance the body\’s immunity, but you need to be careful not to exercise too much intensity to avoid affecting the fetus; 2. Keep warm. Keep the indoor temperature comfortable while sleeping