A recently published study by Canadian researcher at McGill university has found that: "Among women without known prior mental illness, gestational carriage was associated with a higher risk of new-onset mental illness compared with non–gestational carriers who conceived without assistance or with IVF."
Including "The findings of additional analysis suggest that some gestational carriers may experience grief from relinquishing the newborn, such as that described after adoption or removal of the child into foster care — something that needs detailed study."
This researcher (Maria Velez) has also found in past studies that surrogates (gestational carriers) also have higher morbidity outcomes.
These are worrying findings in light of surrogacy births in the US doubling between 2014 and 2019.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2836835