Normally, the testes develop in the abdomen of a featus and move down into the scrotum before or shortly after birth. If this descent does not occur, the testis may remain in the abdomen or may be located along the way such as in the inguinal canal.
In the case of undescended testicle(s), there are generally no obvious symptoms, other than the inability to feel the testicles in the scrotum (testicular sac). A physical examination can sometimes be challenging, even for your GP, who may need to refer your child to a paediatric urologist for confirmation of the diagnosis and to decide on the next steps for treatment.