If the mother is a carrier of Haemophilia, then there is a chance that the baby will be born with Haemophilia.
If there is a history of Haemophilia in the family, then there is a higher chance that the baby will have Haemophilia.
Prenatal testing, in this case, is necessary.
Haemophilia A and B are detected by prenatal testing chorionic villus biopsy in the first trimester by tracing the mutation or informative genetic markers.