My 6.5 months baby have hb e beta thall and she needs monthly transfusion.is it seems dangerous? yesterday she taken transfusion when her hb was 7.02.

There's no choice: If a baby cannot make enough of her own red blood cells, she cannot grow and develop. Even though there are problems that come with transfusions, the child has no choice, because she must get enough blood in her body to live and grow. When asking about your baby, be sure you say "hbe beta thal major". That way, doctors will know you are not talking about "thal minor", which is very common.