Why do I always worry that my child will get sick inexplicably?

Maybe a mother who just gave birth to a baby will have this kind of psychology. My sister is always worried about what will happen to the child after giving birth and whether it can grow up healthily. She can't read the report about her children, so she will put it on her children. Actually, I feel a little too worried. Only when the mother is strong can the child grow up healthily.