Jennifer Garner says she's evolving as a mother.

The 40-year-old actress has three children, Violet, six, Seraphina, three, and five-month-old Samuel, with husband Ben Affleck and admits she's become more relaxed with the arrival of each child.

Speaking in an interview with Andrew Freund, Jennifer - who plays mother Cindy Green in new movie 'The Odd Life of Timothy Green' - said: ''It (motherhood) evolves all the time. With my first child, I was a little more like Cindy Green in this movie who is just obsessively trying to make sure her child is happy at every moment ... as many first time moms can be. Then you kind of learn to let go of some of that, you chill out a bit.''

While she loves being a parent, Jennifer recently revealed she doesn't want any more children, even though Ben does.

She insisted it is going to be an ''uphill battle'' to convince her to get pregnant again because she is happy with the kids they have and wants to stop extending their family.

She said: ''The fact that Ben wants another [baby] is true. But I can tell you that would be a pretty uphill battle with me. I am not anticipating having any more kids!''