Knox said he was so worried when he first arrived on scene that he almost forgot to put his police cruiser in park.
Knox later wrote about the experience, saying Ma'Yavi began breathing again before "she smiled at (him) for a second and then started crying which was music to (his) ears."
"Out of my 25 years being a cop, this is my greatest and most profound accomplishment, and it made every second of those 25 years worth it all," Knox wrote on Facebook.
Days after the incident, Knox posted on his Facebook page again, writing that Ma'Yavi's parents had asked him to be their daughter's godfather, which he said would be his "honor, privilege and pleasure."
His initial post has garnered praise on social media, with more than 60,000 users sharing the heroic tale as of Tuesday.
The public outpouring and support has left Knox "overwhelmed," he wrote.
Knox said the girl's parents sends him pictures and videos of her every morning. He said he expects Ma'Yavi to be close with his five grandchildren.