The 37-year-old "Guardians of the Galaxy" star, who has nine-month-old twins Cy and Bowie with husband Marco Perego, said people are too busy thinking about physical appearance rather than mental health, reported People Magazine.
"Throughout the years that I've been in this business, women that hide in a cave and they don't come out until they're a size zero. And that is a very misleading message to send out to women, especially when women here in LA are the skinniest women out there.
The "Avatar" actress said women should not be desperate to get back to their pre-baby figure.
"I feel bad for those women that get super desperate and want to bounce back three months after having a baby.
"Breastfeed. Stay home. Sleep. Your kid is only three months old... I definitely took a break. And I trusted that my body was going to bounce back when it was ready. I never wanted to push myself..." she said.