Edith Vega said she put her son down to print her boarding pass at the Spirit Airlines kiosk on Monday, according to an incident report from the Atlanta Police Department. When she looked away briefly, he disappeared, she told authorities.
The boy had climbed onto the conveyor belt and was taken back to the TSA bag room, where agents saw him and stopped the belt.
Vega said she was told her son was on the belt for about five minutes.
"Spirit Airlines is aware of an incident at Hartsfield-Jackson International in which an unattended child passed by a section of our ticket counter that was not staffed or open at the time," the airline said in a statement. "The child was able to access a back baggage area via a bag belt and sustained some injuries. We are currently working with TSA and airport officials to ensure all protocol was followed. We wish the child the best in their recovery."