Scientists working with mice say they've pinpointed a possible cause for postpartum depression. According to the study, having offspring causes proteins called GABA receptors to become unregulated in the brain, and this may cause post-delivery mood disorders ranging from "baby blues" to postpartum psychosis. Researchers also found that giving mice with postpartum depression symptoms Gaboxadol, a drug intended to treat sleep disorders, eased the mice's condition. The next step, scientists say,...