Brad: Fatherhood 'absolutely sublime'

Brad Pitt says fatherhood is "absolutely sublime".

The actor, whose baby daughter with Angelina Jolie is a month old, has also co-adopted her first two children, Cambodian Maddox and Zahara, from Ethiopia.

He says being a father had made him more of an activist on issues such as child poverty.

"Whether you have them or adopt them, they're all blood," he said of his brood. The 42-year-old revealed that he looks at Zahara and imagines what her life could have been.

"They need our help, and we should be doing more," he said.

As well as highlighting the African issue, he also said he planned to get more involved with a project to help rebuild New Orleans after Hurricane Katrina.