For too many moms — about 1 in 8, CDC research says — the joy of a new baby is marred by the isolating experience of postpartum depression. And, to quote Chrissy Teigen, postpartum depression doesn’t discriminate — anyone can be affected, celebrities included. “I just didn’t think [postpartum depression] could happen to me,” Teigen wrote in 2017 for Glamour. “I have a great life. I have all the help I could need… that’s part of the reason it took me so long to speak up: I felt selfish… saying...