?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=The+functions+of+postpartum+depression&rft.creator=Hagen%2C+Edward&rft.subject=Sociobiology&rft.subject=Clinical+Psychology&rft.subject=Evolutionary+Psychology&rft.description=Evolutionary+approaches+to+parental+care+suggest+that+parents+will+not+automatically+invest+in+all+offspring%2C+and+should+reduce+or+eliminate+investment+in+their+children+if+the+costs+outweigh+the+benefits.++Lack+of+paternal+or+social+support+will+increase+the+costs+born+by+mothers%2C+whereas+infant+health+problems+will+reduce+the+evolutionary+benefits+to+be+gained.++Numerous+studies+support+the+correlation+between+postpartum+depression+(PPD)+and+lack+of+social+support+or+indicators+of+possible+infant+health+and+development+problems.++PPD+may+be+an+adaptation+that+informs+mothers+that+they+are+suffering+or+have+suffered+a+fitness+cost%2C+that+motivates+them+to+reduce+or+eliminate+investment+in+offspring+under+certain+circumstances%2C+and+that+may+help+them+negotiate+greater+levels+of+investment+from+others.++PPD+also+appears+to+be+a+good+model+for+depression+in+general.&rft.date=1999-09&rft.type=Preprint&rft.type=PeerReviewed&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F1720%2F3%2Fppd_for_cogprints.pdf&rft.identifier=++Hagen%2C+Edward++(1999)+The+functions+of+postpartum+depression.++%5BPreprint%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F1720%2F