Abi was on a bus from Brisbane to Fraser Island when she stopped to get painkillers in Noosa for what she thought was period pain.
The pain escalated quickly and paramedics realised she was about to give birth, despite showing no signs of pregnancy.
On the way to the Sunshine Coast University Hospital, a critical care paramedic with emergency labour experience joined the team and helped deliver the 1.7kg baby in the ambulance.
Advanced Care Paramedic Joanna Cairns said the whole thing was one constant surprise for the team as Harry was born in his amniotic sack.
'Luckily my partner had already seen one of those births as she had a lot of experience, but because Abi didn't know she was pregnant we didn't know if Harry was a full-term baby.'
The father Sam was travelling with his brother in Sydney and was able to get a flight to be with his new bub within five hours.
Over the next few weeks, hospital staff were able to determine Harry was close to full term due to his feeding habits and other milestones.
Ms Cairns said the new parents were able to stay with a family friend in Brisbane who was a midwife which 'was absolutely amazing,' they also received help finding baby supplies.
Harry received an Australian birth certificate but had to wait for his visa and passport before the family could travel home. They arrived back in the U.K. in August.
Ms Cairns described the experience as a once in a lifetime opportunity and 'one of the best days of my lives that we were absolutely blessed to be a part of.'
