The 49-year-old actress had adopted Isabella, 23, and Connor, 20, with her former partner Tom Cruise, and has biological daughters Faith, five, and Sunday Rose, eight, with her husband Keith Urban.
"I always knew I'd adopt, I just always wanted a child. I think from a very early age, I wanted a child. I knew that I was going to have a child and that it didn't matter [how], I actually didn't know if I was ever going to give birth to a child. So that was the least of it for me. And what I did first was adopt," Kidman said.
"That's what I love about this movie, and what I keep trying to say.
"Once the bond is there between a mother and a child, the biological part of it is sort of the least important part. I think when that bond forms, it's astounding how powerful it is.
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