The phrase "infant galaxies" refers to very young and newly formed galaxies in space. These galaxies have recently started to develop and are in the early stages of their existence. Full definition
More recent lensing discoveries have found lensed infant galaxies from even further in the past. (astronomynotes.com)
Over the last few years, Hubble has given us views of infant galaxies as they were just 500 million years after the Big Bang, allowing cosmologists to see how quickly the raw materials from the newborn universe coalesced into stars and then galaxies and then clusters of galaxies. (discovermagazine.com)
While Hubble sees infant galaxies, Webb will show us newborns. (hubble25th.org)