The 43-year-old, who is currently dating actor Justin Theroux, has apparently lost the desire to start a family, reported Showbiz spy.
"Quite simply, becoming a mother just doesn't seem as important to Jen as it once was. Her main priority is her relationship with Justin.
"Justin was open from the start that he wasn't looking to start a family anytime soon and far from being a deal-breaker, which it once would have been, Jen has realized that she's OK with that," a source said.
Aniston wants to concentrate on her relationship first before thinking about putting a step forward.
"Jennifer is not ruling motherhood out altogether, but right now she is focused on her relationship with Justin. She may re-evaluate down the line