How can there be an attachment disorder if there was not enough time for any attachment to develop?
The attachment develops before birth. A baby knows his or her mother from inside her body, separating the baby from their mother is what would cause the attachment disorder. An attachment from baby to mother doesn't need time to develop, it already exists pre-birth.
To the earlier point re different cultures, here is a 2018 study on pregnant women in Iran (my bolds).
"Data gathering would start at the first trimester of pregnancy, continue during second and third trimesters of pregnancy, first visit after delivery, two, four and end 6 months later."
In a sample size of 400.
"This process should be studied during pregnancy and also after delivery so that the effect of related factors and the changes in attachment over time could be determined and comprehensible information about the effective underlying conditions on this issue would be gathered.... Inappropriate development of attachment would have an adverse effect on the regulating part of child’s right brain; different related studies have reported lower emotional and mental development, weak social interactions, school refusal, and more aggressive and hostile behaviors during childhood, behavioral disorders during adolescence and more tendencies toward drug abuse during adulthood 100, 255].... Since all of the mother’s behaviors, actions and thoughts during pregnancy could have more permanent effects on the fetus than any other period of child’s life 422_] and also since pregnancy is considered a critical period in the development, therefore it is necessary to evaluate mother’s attachment to her fetus more accurately."
Discussion
The results of the study will be provided to maternal child health policy-makers in the health system. This information could not be obtained through cross-sectional studies and through one episode of data collection and more studies are needed to provide us a perspective of the mother-infant relation over time. Studying attachment during pregnancy would provide us a chance to learn more about this process."
During pregnancy - as in. It happens. Surrogate mothers calling themselves 'extreme babysitters' and 'ovens' might soothe their minds but the baby doesn't separate himself or herself (or themselves) from their mother.
"Attachment as a set of internal behaviors that would cause the infant to become close related to his/her main caregiver, who is usually the mother, was first introduced for the post-partum period, but it is believed that attachment starts long before birth, during pregnancy.According to the evidences, this relationship could be affected by different factors like nationality, cultural, mental and social conditions and individual’s past; namely women who have not experienced a secured attachment during their childhood might encounter problems in developing an attachment to their infant.
The review of literature about related factors to prenatal attachment among different groups of pregnant women have emphasized that despite the numerous evaluations and different methods of studies, further studies are required in this field."
See link with references/citations here
https://reproductive-health-journal.biomedcentral.com/articles/10.1186/s12978-018-0620-6
I know this doesn't meet your narrative Plan and I know you have a long history of being involved with surrogacy as we have discussed before on other threads.
We have different points of view on this and I expect that no amount of reading or sharing links will change that, nor does it need to.