Final answer:
The differences between newborn and mature male and female genitalia include the development of external reproductive organs, testes in males, and ovaries in females.
Step-by-step explanation:
At birth, the only visible difference between the genitalia of newborn males and females is their external reproductive organs. Both sexes start with the same reproductive tissues in the embryo, but sexual differentiation begins during the fetal period. The development of the male reproductive system includes the testes, epididymis, vas deferens, seminal vesicles, prostate gland, bulbourethral glands, and the pen.is. In females, the reproductive system includes the ovaries, fallopian tubes, uterus, cervix, and v.agina.