Can a 12 year old impregnate a girl?

Yes, a 12-year-old can potentially impregnate a girl if he has started producing sperm, which can occur after the onset of puberty. Puberty typically begins between ages 9 and 14, so some boys may be capable of fathering a child at that age. However, it's important to note that engaging in sexual activity at such a young age raises significant legal, ethical, and health concerns.