The toddler was in the countryside with his family near the village of Totalán when he fell into the well, Bernardo Moltó, spokesman for Málaga's Guardia Civil, told CNN.
The well is only nine inches in diameter, Moltó said. Rescuers lowered a micro robot with cameras over 260 feet into the hole but were unable to locate the boy, he added.
"We haven't found or heard the child; that is why we are taking the time we need to take to find him," Moltó said.
