Although there is a lack of scientific proof, many psychologists, psychiatrists, and developmental biologists believe there is a special tie that develops between a pregnant mother and a child in her uterus. A study done in Japan that was designed to evaluate the maternal-fetal relationship found no significant correlation between the maternal-fetal attachment and depression. Additional research has shown that surrogate mothers are less attached to the fetus, which is most likely due to encouragement by their agency to feel detachment toward the fetus during pregnancy. Although many surrogate mothers admit to feeling sorrow and distress when relinquishing the child, they also felt a sense of happiness and satisfaction for the new parents of the baby. In this study, the intended mother was more anxious than the surrogate mother, but overall they were found to share comparable stable psychological characteristics. This study also reassures the fact that many surrogate mothers are capable of feeling a lack of anxiety and flat responses towards the baby and pregnancy, which suggests their psychological state may not lead to peri-natal or surrogate arrangement complications.