Gwyneth Paltrow wants another baby.

The 40-year-old actress - who has children Apple, eight, and six-year-old Moses with Coldplay frontman Chris Martin - is considering planning one final addition to their family, even though she knows it wouldn't be sensible at her age.

She said: ''My brain says, 'Oh, I think I'm done, the kids are big now and I don't want to go back to changing diapers'. But a part of me would love to have another. Of course, I'm old now!''

The 'Iron Man' star loves being a mother and says she relates to both her children differently, especially since she suffered from bad post-natal depression when Moses was born.

Gwyneth explained: '''When Apple was born, she had the hugest blue eyes. I looked into them and she was looking at me, and I felt like, 'You are here to teach me everything'. After Moses was born, I had postpartum depression. It was a difficult time and because of that, I believe I have an extra empathy for him and he for me.''

However, the blonde beauty admits she often turns down exciting film roles for the sake of looking after her family because she believes it's a woman duty to make sacrifices for their husband and children. She added to InStyle magazine: ''I look for an interesting supporting part about once a year. That's the most I can manage. Some women can do it and that's fantastic, but I can't. You make choices as a wife and mother, don't you? You can't have it all. I don't care what it looks like.''