I have a friend who is a carrier of thalassemia. the girl he intends to marry is also a carrier. does this mean they can't have children?

No: That means they are at higher risk for having a child with anemia

No: But they need testing in early pregnancy to be sure child not affected

Not infertile: But they have 25% chance that any child will have full blown thalassemia major which is devastating, 50% that child will also be carrier & only 25% child will be thalassemia major or carrier free. They have as much chance of having children as any other couple, but is it worth it?