If the baby is very small (<3 months), then "经常给她掰一掰" is worse. I could be wrong though. I just remember treatment was opposite for a newborn or for an older baby (5 month?) Physical therapy is very effective. Also, the sooner, the better. My daughter went through 2-3 physical therapies when she was 6-8 weeks. It solved the problem completely. The doctor said that it would be much harder to fix had she been 6 months old. It could take many sessions.