Hundreds of Lindsay Clancy supporters have gathered to silently support the Massachusetts woman on trial in the killings of her three children. Many wore pink for Thursday's rally. Some had messages on their shirts like “Peace For Lindsay” and “Justice For Lindsay.” Many said they came to raise awareness about postpartum depression and also the mental health system treats women. Clancy’s lawyer does not dispute that she killed the children, but says she should not be held criminally responsible because she was mentally ill. The trial has brought attention to postpartum psychosis. Clancy's lawyer says she had the rare mental illness that is linked to the stress, sleep deprivation and hormonal changes that follow childbirth.

A key question in a Massachusetts murder trial is whether postpartum psychosis drove a mother to kill her three children. Postpartum psychosis is a rare and dangerous condition estimated to afflict 1 to 2 per 1,000 women after delivery. Medical experts describe it as a mental health emergency affecting someone’s sense of reality. Symptoms may include hallucinations, delusions, paranoia or other behavior changes. A woman may also have mood changes, such as mania or depression, disorganized thinking or behavior, insomnia, irritability or agitation. The condition is treatable, but experts say it is best to get treatment early.