Is the husband entitled to request proof of the newborn's paternity through DNA testing, given his consistent use of contraception or coitus interruptus, and his suspicions regarding his wife's conduct?

The child is legally attributed to you because you are the master of the bed. However, if you are certain or it is highly probable in your estimation that he is not your son, you may disavow him through mula'anah (oath of condemnation), and the paternity test should be conducted before the mula'anah. It is not permissible to disavow a child merely due to azl (coitus interruptus) or lack of resemblance, nor is it permissible to disavow him because you do not feel affection towards him. If you are certain that he is not your son due to a combination of indicators (coitus interruptus, the wife's lack of chastity, and the paternity test result), then you may perform mula'anah with her and disavow him. However, mere doubt and weak suspicion do not permit this. One must be wary of the severe warning for those who disavow their child or introduce someone who does not belong to a people. A woman who leaves the house without her husband's permission and is suspected of lacking chastity is not suitable as a wife for you unless she repents.