My ds has in the past couple of weeks taken to wildly arching his back. He does it very suddenly when I pick him up, several times in succession and usually starts crying and seems very angry. He also does it when I am dressing him, when he is in his high chair, and when I am lifting him into his cot. I dont know whether to bother the doctor as one minute he is fine, but the next arching away and beside himself about something. Can anyone tell me - is this normal? Am I getting stressed about a very common phase all babies go through? He does it so violently that is is really distressing me, and I hate not knowing if there is some underlying cause for it..that he might be in pain? Any advice would be really appreciated.