The couple has had an on-and-off relationship since April 2017.
They have a 2-year-old daughter, Stormi, and a nearly 1-year-old son.
The couple has not publicly confirmed their son's name or shared any photos of him.
Kylie and Travis first split in fall 2019, but reconciled quietly.
Kylie spent Christmas and New Year's apart from Travis.
They are known to remain friends and co-parents despite their breakups.
Travis and Kylie have not legally changed their son's name on his birth certificate, despite having a new name for him.