The discovery of oligospermia and azoospermia during the birth of a second child is usually due to vasovaginal obstruction, mumps, testicular pathology and other causes. 1. Vasovaginal obstruction: It means that the testicles of a man have the ability to produce sperms, but the tube that carries the sperms is blocked. In most cases, it is caused by sexually transmitted diseases or urinary tract infections, and can usually be treated with vasectomy. 2. Mumps: When men suffer from mumps, it can lead to an immune attack on the testes, which in turn affects their ability to produce sperm. Mumps can easily be complicated by orchitis or cryptorchidism, both of which can lead to oligozoospermia and azoospermia symptoms. 3. Testicular lesions: if men are sedentary, due to the high temperature in the abdominal cavity, thus inducing bilateral cryptorchidism, thus azoospermia occurs. Or when bilateral epididymal tuberculosis occurs, the vas deferens and epididymis become blocked, caseous necrotic changes occur during the period, and the products block the vas deferens, which may cause oligospermia and azoospermia. Therefore, if there is oligozoospermia and azoospermia when having a second child, secondary causes are generally considered, such as blockage of the vas deferens, mumps, and testicular pathology, etc. It is recommended to go to the hospital in time to check the ultrasound of the vas deferens, to clarify the cause of the consultation.