AN inner west cafe is facing a breastfeeding backlash after a nursing mother claims staff told her to stop and that the practice was ''disgusting'' and ''an offence to humanity''.

A nurse-in protest has been organised for lunchtime Tuesday at Newtown's Satellite cafe after word of the weekend incident spread on Facebook.

The protest will follow a similar nurse-in at Martin Place in January, when about 100 nursing mothers gathered outside Channel Seven's studios in protest at comments by Sunrise host, David Koch, who had said women should be ''more discreet and modest'' when breastfeeding in public places.

Regan Matthews said she was initially approached by an apologetic waiter and asked to stop breastfeeding her nine-month-old son while at the Wilson Street cafe on Saturday afternoon on the instruction of management.

''I immediately said 'No, that's illegal to ask me that' and he just said 'Oh, OK', and backed off,'' she said. The owner then approached Ms Matthews and told her she was using her manager's discretion to tell her to stop. ''She said 'It's offensive','' said Ms Matthews, who asked if any of about four other customers were offended. None said they were.