An Edmonton mother charged with drowning her seven-year-old son in a bathtub will not go to trial.

Nerlin Sarmiento is charged with first degree murder, but CBC News has learned that two psychiatrists who have assessed the 32-year-old mother  believe she is not criminally responsible for causing her son's death.

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Nerlin Lizbeth Sarmiento, 32, is shown with her husband Florentino Jajoy and her seven-year-old son, Omar Jajoy. (Facebook)

Instead of a trial, a two-day hearing in front of a judge is scheduled to begin Sept. 12.

Crown prosecutor Kim Goddard will not call any evidence, but she believes it's in the public's interest that she cross examine the psychiatrists.

Nerlin Sarmiento will admit to drowing her son Omar Jajoy in the bathtub in February.

If the judge agrees with the mental health experts, Sarmiento will be committed to Alberta Hospital until a panel determines it's safe to release her.

At the time of the boy's death, Sarmiento's husband Florentino Jajoy told CBC News that Sarmiento had battled mental illness for the last two years.

With files from CBC's Janice Johnston