The images show Pamela Rauseo giving CPR to her 5-month-old nephew Sebastian. On Friday morning, she spoke exclusively to ABC News.
Rauseo says she was driving along a busy highway when she noticed Sebastian was turning blue. The infant was born premature and with respiratory issues.
"I don't know how I remembered what to do," she said. "I just knew I couldn't let him die. I had the baby in my arms and he was completely limp and I kept screaming for help."
A photographer with the Miami Herald saw what was happening, stopped his car, got help, and took photos.
After all that a happy ending -- the baby is recovering in the hospital.
Rauseo says she learned CPR seven years ago because her own son had breathing problems.