As the uterus grows during pregnancy, it presses up on the diaphragm and out on the abdominals to make room for the baby. This in turn causes the rib cage to be in a constant state of expansion, decreasing the ability of the rib cage to contract to a “normal” state. When the mobility of the rib cage decreases during pregnancy, you can have difficulty with upper extremity movement, posture, back pain, and lower extremity mobility. These accommodations don’t just “bounce back” after pregnancy.  There needs to be a concentrated effort at working on rib cage mobility after pregnancy to get everything moving again.