This is called undescended testicles or cryptorchidism.. In such cases, pediatricians usually wait and watch. Quite often, the testicles descend on their own (3%-5% of boys are born with this; by 6 months, only 0.8% still have an undescended testicle without any intervention). If, by 6 months or so, the testicle still can't be felt, you may want to consult with a pediatric urologist.