I have an adopted son who is thalassemia major. He is now 4 years old. He was diagnosed at 11 months and was not able to sit at that age. He had monthly transfusion since then and was only able to walk at 18 months. He was thought to have developmental delay then. He was also diagnosed with medium hearing loss on both sides of ears at the age of 3. He has had hearing aids for the last 8 months. He has definitely caught up now. He can sing, dance, write his name, recite my phone number, fight like his Power Rangers Ninjas. So, I can safely say, he is normal. With regular transfusions, they will catch up.