Sheffield, England: Premier Gladys Berejiklian has made an extraordinary appeal to her upper house colleagues to consider "strengthening" the abortion bill as she comes under pressure from conservative MPs.

Ms Berejiklian said she would be prepared to change the Crimes Act to ban gender selection abortions and encouraged upper house MPs to give the issue "careful consideration".

NSW Premier Gladys Berejiklian. Credit:AAP

The Premier made the comments in Sheffield on Tuesday (Wednesday AEST), where she was visiting as part of a trade mission to the UK and Germany.

The issue of gender selection abortions has been seized on by some MPs after the abortion decriminalisation bill passed the lower house last week.