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Muscular changes are caused by hormones (relaxin), changes in your center of gravity, and the rate at which your new baby gains weight while growing inside of you.
Neck and shoulder muscles become tight, contributing to occurrence of headaches and carpal tunnel
Increased breast size strains pectoral muscles and may cause slight slouch in shoulder
Ribs expand as uterus grows and pushes organs up and out of the way
Weight of uterus causes your pelvis to tilt forward on your hips, changing your center of gravity. This may cause you to walk with your legs farther apart and feet turned out (pregnancy waddle)
Your knees may become hyper-extended as you try to offset the change in center of gravity
Ankle sprains are common as ligaments relax
Calf muscles become short and tight, causing muscle cramps when you point your toes and while you sleep at night.
