Beside her - Lucilla Godoy, who had given the five-month-old mouth-to-mouth just moments before.
Al Diaz, a photographer for the Miami Herald, captured the stunning images.
"I look up and a woman pops out of her car and started screaming my baby can't breathe, my baby can't breathe. Call 911," said Diaz.
Diaz was driving on the expressway, and pulled over when he saw the commotion.
"I ran out into traffic, looking for help, someone that would know CPR, so that's when Lucilla Godoy popped out of her car," he said.Godoy was able to resuscitate Sebastian but moments later he stopped breathing. Godoy and a police officer sprang back into action.
"I was just trying to help. I wasn't thinking, really. I was just holding the baby like it was my baby, I did what I thought I would do if my baby was in that situation," said Godoy.Godoy and Rauseo stood alongside first responders making sure Sebastian was safe.
"The hero is Lucilla and the baby's aunt," said Diaz.
"I'm not a hero, I just did what you would have done, I'm sure, if you were there and you see what I saw. You would have stopped I'm sure," said Godoy.