The babies, including Hudson Munds (Kallaroo), Hugo Kirby (Kingsley), Lucienne Genillard (Warwick) and Holly Bayford (Woodvale), were all born on May 18.
Obstetrics ward clinical nurse manager Sandra Flugge coordinated the photo shoot on May 20 to mark the highest number of births in a single day since the private hospital opened in March, 2013.
"My role is less hands-on these days, so I relished the opportunity to give each gorgeous newborn a cuddle while we were setting up for the photo," she said.
Get in front of tomorrow's news for FREE
Journalism for the curious Australian across politics, business, culture and opinion.
READ NOW"We were delighted that the parents of all 13 babies were keen to participate in the photo shoot.
"I advised the mums to give their baby a feed before the shoot to ensure they were nicely settled.
"We ensured all babies were wearing their ID bracelets and each baby had one or both parents present while the photo was taken."
Mr Kershaw said the stage for the shoot was set up on the floor of the special care nursery. He said the best photo featured the "wriggling baby" in the middle.
Joondalup Health Campus's obstetrics and gynaecology director Cliff Neppe said more than 920 babies had been delivered at the private hospital so far this year, compared to 760 at the same time in 2014.
Dr Neppe said public births at the hospital had also risen, bringing the total number of private and public births at the health campus to almost 3500 annually.