A cashier at the Kangaroo store on Souh Cannon Boulevard noticed Luis Juan Juan, 26, of Riverview Drive nearly lose his balance while trying to use the pump, then saw the child and notified police.
"The baby was sitting in the car seat with the windows rolled up and the vehicle not running and was sweating," officer David Dye said in his report. Dye and officer Tracey Nelson immediately removed the baby, who was taken into the store to cool off.
The child was eventually turned over to its mother, police said.
Field sobriety tests were not given to Juan because officers said their main concern at the time was the child's welfare.
Officers noted two open cans of beer in the van's console.
Juan said he was aware he had left the baby in the hot vehicle and admitted consuming a "big bottle of beer" before driving to the store, according to police. He was less aware at the judicial commissioner's office, where police said Juan was unable to stay awake long enough to answer questions.
Juan was charged with reckless endangerment, child neglect, DUI, no driver's license exhibited on demand and possessing an open container. He was being held on $10,500 bond Friday.