BOULDER, Colo. -- A doctor who delivered a baby in 2006 has testified she saw no signs of abuse until a week before the 10-week-old baby died with 20 broken bones and a fractured skull.

Dr. Jill Siegfried took the stand Monday in the trial of Molly Midyette, who is charged with fatal child abuse in the March 2006 death of her son Jason.

Siegfried testified that Jason's parents did not tell her about any troubling symptoms until Jason was brought to her office on Feb. 24, 2006, with indications of a head injury.

Prosecutors allege Molly Midyette did not seek medical attention for her injured son. They have charged her husband, Alex Midyette, with hurting him.

Alex Midyette is set to go on trial in January on four counts of fatal child abuse. According to the indictment, Alex Midyette admitted to accidentally hitting the boy's head on a chair and table.

Boulder County Deputy Coroner John Meyer has testified that he consulted three outside experts in determining that Jason did not have "brittle bone disease."

The Louisville, Colo. couple have spoken to investigators, but they were indicted by a grand jury last May following a seven-month investigation.