Amost nine months after baby Gammy was abandoned, the explosive claims keep coming.

In an exclusive interview, the agent who arranged the surrogacy says Gammy’s pedophile father promised to support the little boy but hasn’t paid a cent.

Antonio Frattaroli, the American owner of the surrogacy agency involved, says the couple were told one of their babies had Down Syndrome five months into the pregnancy.

He says Farnell listed a number of options, including giving Gammy to an orphanage or dumping him outside a temple.

“They asked me if I could put the Down Syndrome baby in a different room so they wouldn’t have to look at them,” he told 9NEWS.

“It’s like they’re asking me to do their dirty work. I was appalled.”

He said Farnell told him to abort the baby.

“I told him, ‘David, you can’t kill a baby at five months’.”

Mr Frattaroli said Farnell and his wife Wendy had two options – take the baby back to Australia and put him up for adoption or allow the surrogate mother, Goy, to take him.

In an email reportedly sent by Farnell a month before the birth he wrote they had chosen “to go with option 2”.

It's alleged the Farnells agreed to pay Goy around $AU2000 and continue to help her financially every month.

“He never sent her money once he got back to Australia,” Mr Frattaroli said.

He says he didn't know about Farnell's criminal history.

“I did not screen them, that’s my biggest mistake and I’ll admit that to the whole world,” he said.

“They made a very, very bad choice and now for the rest of their lives they have to live in shame.”

The Farnells have gone to ground, offering no response to the latest allegations.

Mr Frattaroli got into the surrogacy business after he and his wife used a surrogate themselves for their baby boys.

He says he wanted to help others and never imagined encountering a situation like this.