Olivia Wilde has found her ''focus'' since becoming a mother.

The 30-year-old star believes her two-month-old son Otis, whom she has with her fiancé Jason Sudeikis, has given her a new prospective on life, but she admits it is a struggle trying to balance her new role as a parent with her demanding career.

Speaking to PEOPLE, she said: ''The amazing thing about becoming a mother is it snaps everything into focus and really makes you understand what's important.

''It's [parenthood is] tricky! It's tricky for every mother, and I salute working mothers everywhere. We are warriors. Suddenly these press lines are less stressful!''

Meanwhile, the 'Third Person' actress has offered up some advice for her pregnant co-star Mila Kunis, who is set to welcome her first child into the world in October with her fiancé Ashton Kutcher, 36.

She said: ''Enjoy the pregnancy, not racing ahead and relishing the moment. I think people see pregnancy as something to get over with, but every stage of becoming a mother is really special.''

However, that shouldn't be a problem for Mila, 30, as she's already admitted that she has loved every aspect of her pregnancy so far, particularly her bigger boobs.

She said recently of her fuller bust: ''They're amazing! They've tripled in size. I was a 34A; now I'm a 36C. I'm so excited! I'm telling everyone I know, 'Go ahead, touch them!' Without being an a*****e, I have to say, I love being pregnant.''