Stellaris 4.0 update introduced babies to the game through the BioGenesis expansion on May 5.
Babies in Stellaris are considered pre-sapient and not productive for the first five years of their existence, but can eventually become productive members of society.
A bug in the game mistakenly categorizes babies as 'pre-sapients' who can be exterminated, but in reality, the bug seems to be purely visual and does not affect the population growth.
While the bug allows for the extermination of babies in the game, it appears to have no actual impact on the gameplay, prompting calls for it to be fixed by Paradox.