WA Premier Colin Barnett has rejected calls for rules to be relaxed to allow MPs to breastfeed on the floor of Parliament, saying it is "unnecessary" for a mother to take a baby into the chamber.

Mr Barnett's comments come after the newest WA Labor MP Laine McDonald used her inaugural speech to Parliament to call for standing orders to be overhauled so that young children can be brought into the chamber.

That would allow breastfeeding mothers, or other MPs caring for young children, to do so on the floor of the Parliament rather than needing to leave the chamber to do so, in a move Ms McDonald said would create a more family-friendly environment.

But Mr Barnett dismissed the need for change, saying his Government would always accommodate any MP from either side of politics who needed to feed a young child.

"If that mother is not paired, we will always give an immediate pair so that mother can leave the chamber, look after a baby and return when she is finished," Mr Barnett said.

"Everyone respects the mother and the child but not on the floor of the chamber, it is only for Members of Parliament and you don't start to have babies and children in the Parliament.

"All Members of Parliament have their offices within the Parliament where they have got privacy.

"It is not, in my view, necessary for a mother to take a baby into the chamber."

The issue has also previously caused angst in Federal Parliament, where the rules were changed earlier this year to allow MPs caring for children to bring them into the chamber following several controversies.