The defense will present Dr. Phillip Resnick, Dr. Margaret Spinelli, and Dr. Paul Zeizel, all specialists in postpartum psychiatric disorders.
The case draws parallels to Andrea Yates' 2001 trial, where an insanity defense succeeded after she drowned her five children.
Experts note postpartum psychosis is rare but can cause hallucinations and delusions leading to harm.
Lawsuits filed by Lindsay and Patrick Clancy accuse her healthcare providers of misdiagnosis and overmedication, intensifying her condition.
The jury, composed of 12 women and six men, was screened for mental health biases.
The court has prohibited media from recording or distributing Patrick Clancy's 911 call and autopsy photos to protect family privacy.
If found guilty, Lindsay Clancy faces life imprisonment without parole.
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If the insanity defense succeeds, she would be committed to a psychiatric facility for ongoing treatment and periodic review.
