It is so important to have a supportive partner if you finding yourself, or suspicious of, a diagnosis of postpartum depression. It's a scary place to be. You are not sure when and if you are going to come out of it. If your baby is going to remember that, in those first few weeks, you weren't all the way there. A supportive partner is key. I would have to say the best way to get your partner on board with what is going on with you, is just be vulnerable and honest with them. You are with them for a reason. You love them. They love you. So as ashamed as you feel or scared of confused, you just need to tell them. Whether they can actually help or not, you know that you can get the help that you need and they are going to be there to take care of your child.