According to a story in Newsweek, even Queen Victoria had postpartum depression.
“For more than a decade she struggled with pain and postnatal depression, describing infants as ugly and froglike. She frequently told her husband he did not understand the sacrifice involved, and the exhaustion. ‘I own,’ she later wrote to her daughter, ‘it tried me sorely; one feels so pinned down—one’s wing’s clipped—only half oneself … I think our sex a most unenviable one.'”