Doctors say being born with sac intact is 'extremely rare' and happens in just around one in 80,000 births, reports CBS.
His little hands and feet were clearly visible and the doctors performing the Caesarean section on his mum, Chelsea, were very surprised to to see the sac was still intact.
The images show Silas curled up inside with the placenta and umbilical cord and Dr William Binder, who delivered Silas described the moment as mesmerizing.
He told CBS LA: “Even though it sounds clichéd, we caught our breath.
“It really felt like a moment of awe... and one that will stick in my moment for some time.
“He was seconds old and still in the water bag, with the placenta and umbilical cord tucked inside.”
Dr Binder was sure to take photographs of the special moment and then he set to work removing Silas from the sack.
Silas’ mum, who didn’t even realise the excitement, told CBS LA News: “It was definitely like a clear film where you could definitely make out his head and his hair.
“He was kind of in a foetal position and you could see like his arms and his legs curled up.
'It was actually really cool to see. And when I heard that was actually really rare I was like "oh my gosh you're a special little baby".'
Despite being born at 26 weeks, Silas is doing so well that doctors hope he will go home next month.
Photo Credit-daily news/yahoo