The woman gave birth in the chopper after Falmouth Coastguard received an emergency call from the Isles of Scilly yesterday.
The RNAS Culdrose crew tried to get her to hospital before delivery, but had to tell the coastguard the crew of seven had "just increased to eight", BBC reported.
Mother and baby are thought to be both doing well, after being examined at the Royal Cornwall Hospital.
The child was delivered by a midwife who had flown out to St Mary's.
"The midwife started to get a little bit excited and said we'd better start getting prepared for the birth," he said.
"So, we got the equipment ready and we gave mum as much encouragement as we could."
According to the coastguard, it was the second time a woman in labour had been flown to the mainland.
"But, the one earlier made it to the hospital in time," a spokesman was quoted as saying by BBC.
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