How harmful is an X-ray health check for a one-year-old child?

NO HARM DEAR MOTHER..the doses of energy needed for casual x rays are so small that nothing will happen.. the most harmful dosesare which given to a pregnant mother for her fetus but this also depends on the gestational age of the fetus and also to the part xray has been radiated and to the kind of procedure ... so DONOT WORRY AT ALL I PROMISE YOU....