What do you suggest if i want to know if the man with kline felter syndrome(man with small testicles) can overcome infertility and become a father?

Find other options: An XXY / klinefelter's man usually will never be able to become a father, though you may want to check in with some advanced fertility specialists. This would be a great time to find other ways to fulfill your desire to care for young people -- as a foster-father, adoptive father, coach, religious educator, police officer or whatever way the universe seems to direct you.