First of all, vaccination is very safe. Signing shows that you know the situation of children's injections and know the precautions and taboos. If there are contraindications, you can't fight. If there are no contraindications, you can call. Even if there is an abnormal reaction, you are not responsible. (Because many parties are not at fault, in this case, the first-class vaccine is compensated by the state, and if it is the second-class vaccine, it is compensated by the manufacturer. )