"(1) the child is born or conceived in wedlock; (2) the child, if not born or conceived in wedlock, is legitimate by the law of the domicile of each of his parents at the time of his birth; or (3) the child's parents marry after the birth of the child and under the law of the father's domicile at the time of his birth and at the time of the subsequent marriage of his parents, the child is legitimated by that marriage."