When there is a question of paternity in an unborn child, you may wish to have a prenatal paternity test performed in order to determine the actual father of the child. Just like a paternity test that is done after a pregnancy, the test will compare the DNA of the mother, the unborn baby and the supposed father in order to establish paternity. DNA comparisons have been performed since 1953, when it was discovered that we all have DNA and that there is a specific pattern for each individual.