Can you end up with severe back pain just from having a baby?

Body mechanics. Carrying 20+ lbs, a few inches in front of your usual center of gravity causes you to shift your whole skeletal alignment. Yes this can hurt. Best to stretch a lot and get "fit" before , during , and after pregnancy.
Yes. Back pain is pretty common during pregnancy. Though it often improves after delivery, it can persist. After recovering from delivery, return to regular physical activity including regular aerobic exercise (walking, running, swimming, biking, etc) can reduce pain. If the pain is so bad you cannot exercise suggest talking to your obstetrician or primary provider for help in your specific situation.

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4 weeks pregnant, severe back pain. Waiting for doc to call back. Will taking 2.5mg Vicodin affect baby or cause birth defect?

Vicodin caution. vicodin contains hydrocodone, which is opioid, like morpheine, oxycodone, dilaudid, hydro morpheine, codeine, etc. They can cross the placenta and change the baby's chemistry. Taken chronically, they can cause opioid dependence in baby. Back pain in preg is usually mechanical. Ligaments and muscles are pushed around. A good osteopath or manually-trained physical therapist can often help. Read more...