What are the worst types of postpartum depression?

See below: The one that lead to inability to function, suicidal ideations and/or suicide. Thoughts of harm or actual harm to the baby and post-partum psychosis -- delusions, hallucinations that might lead to the acts of self-or other-harm.

Psychosis: If it gets too bad, with no sleep, the mind gets unhinged from reality. This is generally part of a bipolar spectrum issue but sleep is important to prevent psychosis.

Dangerous Ones: Postpartum depression, when severe, can be associated with sleep deprivation, suicidal thoughts, anxiety and intrusive, obsessive, and disturbing thoughts about the baby. Postpartum psychosis is a different condition that is more associated with bipolar disorder and involves hallucinations and delusions and an increased risk of infanticide. Both demand immediate support and psychiatric care.