A Melbourne model who had no idea she was pregnant until she gave birth to a healthy baby girl on a bathroom floor has celebrated her daughter's first birthday.
Erin Langmaid was 23 years old when she suddenly became a mother in October 2019 by unexpectedly welcoming Isla to the world, despite showing no signs of pregnancy.
The size 8 model had been working full time and taking contraceptive injections in the lead up to the birth.
She did not experience typical symptoms of sickness, a baby bump or cravings, and only felt ill on the day Isla was born.
One year on, Ms Langmaid and partner Dan Carty admitted their lives have changed since becoming parents but say they are enjoying the ride.
Erin Langmaid was 23 years old when she suddenly became a mother in October 2019 by unexpectedly welcoming Isla to the world. Pictured: The mother and daughter celebrate Isla's first birthday
One year on, Ms Langmaid and partner Dan Carty admitted their lives have changed since becoming parents but say they are enjoying the ride
'Life's a lot different now, but I wouldn't change it at all... it's been really fun and good,' the young mum told 7NEWS.
Mr Carty said their one-year-old is a 'great lot of fun' with a heap of 'energy'.
Ms Langmaid marked her daughter's first birthday with a video on Instagram.
'One year ago today this little angel unexpectedly entered our lives, what a year it's been of ups and downs but we wouldn't change a thing,' she wrote.
'Thank you to everyone who has supported us this year, you know who you are. Here's to another year with little Isla.'
Ms Langmaid could still fit into all of her clothes in the lead up to the birth.
The size 8 model had been working full time and taking contraceptive injections in the lead up to the birth. Pictured: The young parents with their daughter
Ms Langmaid did not experience typical symptoms of sickness, a baby bump or cravings, and only felt ill on the day Isla was born (Pictured: the young family in hospital)
How does cryptic pregnancy happen?
Fluctuating hormones can lead to slight bleeding that resembles a period, making a woman think she is not pregnant.
Low body fat and athletic activity can cause a period to disappear for months at a time.
People who participate in high-impact sports may also have low levels of certain hormones, making it harder to detect a pregnancy.
Birth control pills and intrauterine devices can make a woman feel confident that a pregnancy just isn't a possibility.
Source: Healthline
She went to the bathroom, and ten minutes later was holding Isla in her arms, who weighed a healthy 3.6 kilograms.
'It was the biggest shock of my life,' Ms Langmaid told 7NEWS at the time.
Mr Carty heard the commotion in the bathroom and was shocked at what he found inside.
'I heard a big scream and I ran in there and opened the door and I was worried about her, and then I saw the little one and I thought ''hang on, there's two'',' Mr Carty said.
The father said he was 'flabbergasted'.
Isla was born at 37 weeks, with Ms Langmaid having what is termed a cryptic pregnancy, which is where the mother does not find out they are pregnant until very late.
One in 500 women do not know they are pregnant until 20 weeks in.
In one in 2,500 cases, women don't know they are pregnant until they start giving birth.
