Baby Gammy's mum has been forced to leave her two-year-old son, who has Down syndrome, with his grandmother as she flees from loan sharks who 'threatened her with bodily harm.'

Pattaramon 'Goy' Chanbua, the Thai surrogate mother who was hired by an Australian couple to carry Gammy and his twin sister Pipah, told The Daily Telegraph she and her husband, Nid, recently borrowed almost $1,900 – or 50,000 baht – to buy a truck but have been unable to pay the interest.

'The interest is 10 per cent per month, we can't afford to pay it. They have threatened me with bodily harm,' Ms Chanbua said.

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Pattaramon 'Goy' Chanbua (pictured), the Thai surrogate mother who carried baby Gammy (pictured) for an Australian couple, has fled from loan sharks

Ms Chanbua said she hasn't seen her children in two months (pictured is Gammy)

Ms Chanbua (left), who is in her early 20s, said Gammy (centre) is living with her mother, Pichaya Nathonghchai (centre), and her two other young children (pictured), at their home two hours outside of Bangkok

Ms Chanbua and Gammy made headlines two years ago when she claimed the Perth couple who hired her, David and Wendy Farnell, left the disabled boy but took his twin sister back to Australia.

Ms Chanbua, who is in her early 20s, said Gammy is living with her mother, Pichaya Nathonghchai, and her two other young children, at their home two hours outside of Bangkok, as she and her husband move again to an industrial town looking for work to pay off the debt.

It has been two months since she has seen her children, including her six-year-old son and eight-year-old daughter, and she is unsure when she is going to be able to return home, Ms Chanbua said.

Charity donations totalling about $235,000 helped pay for the new three bed-room home Ms Chanbua's mother and children are staying in and she receives an ongoing $530 a month from Hands Across The Water, an Australian charity, to pay for Gammy's medical expenses, according to The Daily Telegraph.

Ms Chanbua and Gammy made headlines two years ago when she claimed the Perth couple who hired her, David and Wendy Farnell (pictured), left the disabled boy but took his twin sister (pictured) back to Australia

Earlier this year, a court found that Mr and Ms Farnell did not abandon Gammy in Thailand after discovering his disability, and allowed the couple to keep Pipah.

WA Family Court chief judge Stephen Thackray said in his ruling in April that the Farnells had reason to believe Ms Chanbua and her husband had wanted Gammy.

He also said expert evidence indicated there was a low risk of Mr Farnell, who is a convicted sex offender, abusing Pipah despite him previously being jailed in 1997 for indecently dealing with three girls.

'This risk must be weighed against the high risk of harm to the girl if she is removed from her current home,' Justice Thackray said.

Ms Chanbua (pictured) said she and her husband, Nid (pictured), recently borrowed almost $1,900 – or 50,000 baht – to buy a truck but have been unable to pay the interest

Earlier this year, a court found that Mr and Ms Farnell did not abandon Gammy (pictured) in Thailand after discovering his disability, and allowed the couple to keep Pipah

It was later revealed by Judge Thackray that the Farnells had lied about the identity of the egg donor for the twins.

In a sworn affidavit, the couple claimed David was the sperm donor and Wendy was the egg donor, and that the embryos had been sent from Perth to Thailand.

But the egg donor was a third party, the court heard.

Charity donations totalling about $235,000 helped pay for the new three bed-room home Ms Chanbua's (pictured) mother and children are staying in

It was later revealed by Judge Thackray that the Farnells (pictured) had lied about the identity of the egg donor for the twins

'I note that the Farnells only told the truth about the identity of the egg donor after the story broke in the media,' Justice Thackray said.

The omission could lead to a maximum 14 years in jail for the couple.

A DPP spokeswoman told Daily Mail Australia at the time that WA Police would investigate.