Born still inside his amniotic sac, baby Silas Philips, who was delivered three months premature, has since been described as a 'medical miracle' by doctors.
Doctors performing the Caesarean section on his mother, Chelsea, at the Cedars-Sinai Medical Center in California were astonished to see his amniotic sac was still intact.
Pictures show Silas curled up inside with the placenta and umbilical cord, his tiny hands and a leg clearly visible.
And until the bag was broken, he was still getting oxygen through the placenta.
The amniotic sac is a bag of clear, pale fluid inside the womb where the unborn baby develops and grows.
The fluid helps to cushion the baby from bumps and injury, as well as providing it with fluids to breathe and swallow. It also maintains a constant temperature for the baby.
Typically the amniotic sac breaks on its own during birth, which is commonly referred to as a mother's 'water breaking'. Or during a C-section, the surgeon cuts through it to deliver the baby.
Doctors say the chance of the amniotic sac remaining completely intact after birth is ‘very rare'.
Despite being born at just 26 weeks, Silas is in very good health.