The little girl, named Saybie, weighed just 8.6oz - the same as an apple - when she was born at a San Diego hospital in December.
Little Saybie was born 23 weeks and three days into her mother's 40-week pregnancy, after her mum was induced into labour due to life-threatening complications
In the video produced by the hospital, the mother described the birth as the scariest day of her life. She said she was taken to the hospital after not feeling well and was told she had preeclampsia. The serious condition causes skyrocketing blood pressure - meaning the baby needed to be delivered quickly.
She said: "I kept telling them she's not going to survive, she's only 23 weeks.". Doctors also told her distraught mum and dad after the birth that they would only have about an hour with their girl before she died. Saybie's mum said: "That hour turned into two hours, which turned into a day, which turned into a week."
Miraculously, the tiny girl survived and began putting on weight in the neonatal intensive care unit - where a pink sign by her crib read "Tiny but Mighty."
More than five months have passed since the birth - and little Saybie has gone home as a healthy 5lb infant.