Santamouse Pink.
I think the birth mother's rights are more important, as she does not know what she is getting into. As you cannot know what being pregnant is like from hearing or reading about it. To me it was all a big surprise, despite reading all I could.
I think she has the right to change her mind, which she well may, as women are not mere babyfactories, but often form powerful bonds with their unborn baby. Giving up the baby coming out of your body could really affect a woman, don't you think?! You have entered into the contract rationally, but when the moment is there you may feel you would rather die than give up this baby. Motherlove is a pretty strong emotion.
Pregancy and birth may well CHANGE how you feel about giving up your baby.
I am not against surrogacy, but really only feel comfortable with it if is a woman who already has children of her own, who does it for altruistic reasons.
Otherwise it smacks of exploitation.
I think the area needs very careful laws.