GRAND PRAIRIE, Texas (CBSDFW.COM) – Their job is to protect and serve and one Grand Prairie police officer has proved it’s not a duty he takes lightly. On Friday at the Mid-Autumn Festival at Asia Times Square, AJ Castaneda saw a choking child and stepped into action.

“All of the sudden I see a lady run out of the entrance and she’s holding a baby,” Castaneda said. “The child was just lifeless. The arms and legs were just dangling there as she ran towards me. She was Nigerian. Huge language barrier.”

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Castaneda said he knew what to do and began giving the one-year-old boy back blows until he spit out a white object and started breathing again.

“I got kind of teary eyed because it’s very emotional,” he said. “You have a child’s life in your hands and it was very, very emotional.”

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In the days following, Castaneda has been called a hero, lifesaver and blessing on social media.

“I’ve been getting a lot of text messages and phone calls,” Castaneda said. “The outpouring has really been great. I’m just doing my job.”

“To me he is a hero,” Asia Times Square CEO Matthew Loh said. “The more I know about AJ, the more I admire him. For him, he just thinks that’s everyday life. That’s amazing. That speaks volumes of his character.”

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“Whatever I can do for the children of the world,” Castaneda said. “I want to give. Children are great. They’re our future.”