Spanish security authorities discovered a "crammed" child behind the front storage box, in a car en route to Spain.
Spanish newspapers said that the place where the boy had hidden was very small and tight, as he had to lie in a "fetal position" and gather his legs throughout the flight, before being discovered by the security forces in Melilla.
A doctor was urgently called, given that the child, whose age has not been revealed, needed urgent recovery and health care.
Security authorities use specialized heart rate detection equipment to find migrants hiding in cars and trucks