Girls, hello everyone. Could you please tell me if anyone has experien…

Girls, hello everyone. Could you please tell me if anyone has experienced something like this... The baby is one week old and he's already lifting his head on the belly and is generally tense, clenches fists, reacts violently to touch. What is it? The doctor said hypertonus and supposedly on monthly dispancerization will be clear but I can't calm myself down and am running the worst thoughts. He also lifts his head when held in my hands...