When doctors told Mozz and Sacha their baby would be disabled, the Christians resisted pressure to abort. According to a new book, they are the fortunate ones in a growing moral problem.

The O'Sullivans, who attend Kingsford Anglican Church where Mozz is the assistant minister, were told their unborn child would have Downs Syndrome, Club Foot, brain damage and other disabilities.

At a forum at Moore Theological College on Friday, they told of the pressure their doctors put them under to have an abortion, the medics being unwilling as the pregnancy progressed to say when the child was conceived.

"They didn't want to date the pregnancy because they wanted to give us the option of abortion," Sacha recounts.

Supported in their decision by the college community and their wide circle of friends, Calvin, now two and a half, was later born perfectly healthy.

"He had none of the conditions that we were told he had," Mozz says.

He remembers one of the doctors immediately following the birth "grabbed the file, threw it on the ground and started checking Calvin out himself'.

Melinda Tankard Reist, author of new book Defiant Birth: Woman who Resist Medical Eugenics (Spinifex) says the pressure that the O'Sullivans faced to abort their unborn child is common in the medical establishment in society's quest for "blue ribbon babies', free of genetic imperfection.

She likens increasingly common genetic screening " which she says is an inexact science, full of "guesses and probabilities' and subsequent pressure on pregnant mothers to have abortions - is akin to medical eugenics used in Nazi Germany's in its quest for a super race.

"Testing and termination is seen as a bargain " it's an economic rationalist approach to human life," she says.

"There is a view now that it is a moral obligation to abort a child with disabilities.

"I don't think it's a progressive value to see a disabled child dead."

Some of the women in her book were told they were carrying "a monster' or told that their baby would only ever be a pet.

Melinda Tankard Reist is an Australian writer and researcher, is a founding director of the advocacy group Woman's Forum Australia and an advisor to Senator Brian Harradine.

Her previous book was Giving Sorrow Words: Women's Stories of Grief after Abortion.

Ms Tankard Reist says it is increasingly common for couples to be "rushed off to have an abortion' even on the slightest suspicion that something might be less than perfect with their baby.

"Women are being seen as maternally irresponsible if they don't have a test to see if something might be wrong," Ms Tankard Reist says.

"[There is a] terribly horrendous pressure being put on families. We are seeing an erosion of empathy for anyone who is different."

She says genetic screening is the new way of concealing people with disabilities who would once have been "shunted away to an institution'.

There are fewer babies being born with disabilities and as a result society is not learning how to care for people with these conditions.

There is a lack of support in society for the difficult job that parents face in caring for children with disabilities, she says.

During her visit to Moore College, Ms Tankard Reist also spoke to third year Ethics students.

Ethics lecturer Dr Andrew Cameron, said "evil is taking hold in society' but the Christian community "welcomes babies in all their forms'.

He encouraged the students to join Women's Forum Australia, support activists and keep the situation in their prayers.