An ultrasound company failed to identify an unborn baby's fatal genetic disorder - and got his gender wrong.
Melissa Barker, 19, paid £45 for a "wellbeing and gender reveal" scan with Window to the Womb when she was 17 weeks pregnant.
She was told she was expecting a little girl whom she named Skyler-Rose and she hosted a gender reveal party with partner Tom Smith, 21.
But Melissa was heartbroken when her 20-week scan on the NHS revealed the unborn child has severe health problems and is only expected to live for a few days.
The abnormalities, including a hole in the heart, weren't picked up the Window to the Womb scan.
Arteries in the tot's heart were also the wrong way round, he had an abnormally large left kidney and stunted arms.
Doctors later confirmed that the baby was suffering from Edwards' Syndrome - a serious genetic condition which causes babies to die shortly before or after birth.
Melissa, of Blackburn, Lancashire, said: "I was completely devastated and heartbroken when I discovered my son, which originally was my unborn girl, had several serious medical issues.
"The clinic did not say there was anything wrong with the baby, it said everything was OK.
"I don't understand why none of this was picked up during the wellbeing scan."
The teen, who is now 24 weeks pregnant, intends to let her pregnancy go full term if the baby survives.
"Week by week we are living in hope," Melissa continued.
"We are hoping for two minutes to hold him. Just to spend some time with him, it's not going to last long.
"We had been calling him Skyler-Rose and our little princess, buying so many things and it all now has to be changed.
"It sounds very stupid but it's like I have lost my little girl."
Window to the Womb, which is based in Blackburn, checked the skull and brain, lungs and heart and the amniotic fluid.
But it did not highlight any issues.
It stresses protocols were followed and the procedure was completed by an experienced sonographer.
A spokesman said: "Melissa's scan was completed by an experienced sonographer who works within the NHS conducting diagnostic scans and we are confident that all of our scan protocols, as laid out by industry experts and our insurance were followed.
"This has been thoroughly checked by our clinical lead sonographer and her conclusion is that, at the time of the scan, there were no signs of any internal abnormalities."
On its website, Window To The Womb says: "The detection rate of abnormalities may vary depending on your gestation at the time of your scan."
It also states that its 16 to 22-week gender scans are 99.9 per cent accurate.
The company has 35 clinics nationally.
Melissa and Tom are raising money to pay for their unborn child's funeral.
