If it feels like your rib cage is getting larger, you're right: It's expanding to make room for your lungs, which need extra oxygen, and for your baby, who may decide to stretch out and push his feet up under your ribs. Some women will feel pain in the upper right corner of their abdomen over the last few ribs. This may be caused by inflammation of cartilage attached to the ribs.
Shifting positions may lessen your discomfort because it may cause your baby to move into a new position too. During the day, sit in a straight-back chair with a pillow behind your lower back to help relieve the pressure and make breathing easier. A warm bath or a heating pad may also help.
Originally published in You & Your Baby: Pregnancy.
All content on this Web site, including medical opinion and any other health-related information, is for informational purposes only and should not be considered to be a specific diagnosis or treatment plan for any individual situation. Use of this site and the information contained herein does not create a doctor-patient relationship. Always seek the direct advice of your own doctor in connection with any questions or issues you may have regarding your own health or the health of others.