Medical experts say postpartum psychosis is a rare but serious condition that differs from the more common postpartum depression.
About 1 in 9 women with a recent live birth experience symptoms of postpartum depression.
Heather Armstrong was one of the first bloggers to document motherhood with her website Dooce.com.
Hayden Panettiere said she wishes she was more aware of postpartum depression going into motherhood.
In May, Chalise Smith gave birth to a healthy baby girl who is, genetically, her daughter and son-in-law's child.
Swank revealed at the end of her "GMA" interview Wednesday that she and husband Philip Schneider will soon be parents.