Liberal backbencher Giulia Jones gave birth to her fifth child on Friday, a 3.7kg boy named Maximus Jones.
Mrs Jones, 34, has a highly can-do attitude to babies in the workplace, having stayed at work through the birth of three of her previous children. And she has already indicated plans to bring the new baby into work within a couple of months.
"Babies are an absolutely normal, essential basic part of women's lives and we should never make a women have to choose between work and having a baby, it's just so retrograde," Mrs Jones said in an interview in January.
Mrs Jones, 34, and husband army engineer Bernard Jones now have four boys and a girl, the others aged 3 to 9.
Mrs Jones was to head home on Monday after the caesarean delivery at Calvary Hospital and said she expected to be back in the Chamber at the Legislative Assembly by the beginning of August.
"Baby number five has been the best delivery I've had so far. Bernard and I are thrilled to have another son and the kids are so excited to have a little brother," she said.
Mrs Jones is a strong supporter of facilities for women to breastfeed at work, but if necessary she would have no hesitation taking baby to the chamber.
"If I'm in the middle of a feed and it's awake I'll just pop it under my arm and take it down to the chamber and if it's starving it'll be fed - because breastfeeding is about babies being fed a lot more than it is about whether women feel like breastfeeding in public or in the chamber or anywhere else," she said in January.
The family shares their home with Mr Jones's mother and an au pair.
Maximus was born at 9.16am on April 17, and measured 50cm.