The Australian Medical Association NSW says the amendments put forward by Attorney-General Mark Speakman and Planning Minister Rob Stokes go against the spirit in which the Reproductive Health Care Reform Bill 2019 was introduced.

The objective of the bill to remove abortion from the state's criminal code risks being derailed by "unfounded fearmongering", the AMA said in a statement on Wednesday.

"The clear intention of these amendments is to seek to impose an additional burden on medical practitioners and to delay access to care," the association said.

Mr Stokes and Mr Speakman's proposed changes include extra requirements for those seeking a termination after 22 weeks, including approval by a hospital advisory committee of at least four members.

The late-term procedures would have to be performed by a specialist medical practitioner - except in cases of emergency - and only in certain facilities.

In its current form, the private member's bill would allow terminations up to 22 weeks, as well as later abortions if two doctors considering all the circumstances agree the termination should occur.

Mr Speakman said he broadly supported dealing with abortion outside of criminal law but was unsure if he could support the legislation without amendment.

"I am troubled by the lack of reference in the bill to the informed consent of the patient. I am troubled by the open-endedness, at least on the face of the bill, for late-term abortions - whatever might be current medical practice," he told parliament on Tuesday.

"While there is majority support for the general notion of abortion not being dealt with by the criminal law, I sense that there is great community unease with late-term abortions."

But the AMA said requiring late-term abortions to be the subject of a committee review "would place women at significant risk of unnecessary delay and only add to their suffering".

"In the vast majority of cases, abortions after 22 weeks arise due to a significant abnormality in the foetus," the association said.

"Families and their doctors already face the most difficult decision of whether to end a wanted pregnancy and these amendments would draw out that process and make it more painful."

The proposed amendments were also criticised on Wednesday by women's rights group Fair Agenda and the NSW Pro-Choice Alliance, while MPs continued to debate the bill in the lower house.

They are expected to begin considering amendments - including separate proposals by other MPs - on Thursday.

Transport Minister Andrew Constance has told parliament he is concerned with amendments being brought forward.

He said on Wednesday that parliament "should not get into the business of starting to proscribe and codify very extensively some of the much needed practices of our medical profession".

Mr Constance, Health Minister Brad Hazzard, opposition leader Jodi McKay, Nationals MP Leslie Williams, Greens MP Jenny Leong and other Liberal MPs Matt Kean and Stuart Ayres are among those who support the proposed legislation.

Opponents include Police Minister David Elliott, Treasurer Dominic Perrottet, Corrections Minister Anthony Roberts and fellow Liberal MPs Tanya Davies, Kevin Conolly and Gabrielle Upton.

Mr Perrottet, who spoke during the debate "on behalf of those who cannot speak for themselves", shared his concerns over late-term abortions and doctors with a conscientious objection being compelled to facilitate abortions

"Under the bill the only meaningful difference between a termination before 22 weeks and a termination after 22 weeks is a second signature," he said on Tuesday night.

Australian Associated Press