HOUSTON (AP) — Andrea Yates moaned, cried and pulled at her hair the morning after she was arrested for drowning her five children, a jail psychiatrist testified Friday in defense of the Houston woman.

The testimony came as Yates' lawyers began making their case to jurors that Yates is innocent of capital murder by reason of insanity.

Dr. Melissa Ferguson said Yates had to be given a sedative while she was being assessed in the county jail's psychiatric unit June 21.

A day earlier, she had called police to her Houston home, then told officers she drowned her children in a bathtub. Conviction could get her the death penalty.

Before Ferguson began testifying Friday, prosecutors finished their case by calling Dr. Harminder S. Narula, an assistant medical examiner who testified about his autopsy of the oldest Yates child, 7-year-old Noah.

Narula said Noah's head, arms and legs had recent bruising likely caused by someone holding him down. Some autopsy photos were shown to the jury Friday but not to Yates or anyone else in the courtroom.

Other medical examiners testified Thursday about John, 5, and Mary, 6 months.

Yates is on trial only for those three deaths. Prosecutors have said she could be tried later for the deaths of the other two children, Paul, 3, and Luke, 2.

On Thursday, the jury heard a tape-recorded June 20 confession in which Yates had only one question for a Houston police sergeant who questioned her.

"She wanted to know when her trial would be," Sgt. Eric Mehl testified.

On the tape, Yates says she intended to suffocate the life from her children, and she details for Mehl how she chased her oldest son, Noah, before forcing him into the same water she used to drown her four younger children.

"How long have you been having thoughts about wanting, or not wanting to, but drowning your children?" Mehl asked during the interview.

"Probably since I realized I have not been a good mother to them," Yates responded.

"What makes you say that?" the police officer asked.

"They weren't developing correctly," Yates said.

She recounted the details of the deadly morning to Mehl in a flat, monotone voice. Yates also told him that she had filled the tub two months earlier with the intention of drowning the children, but didn't go through with it.

Defense attorneys claimed during opening statements earlier this week that Yates filled the tub the first time under a delusional concern about the family's water supply.

Unlike earlier Thursday, when Yates sobbed as photos of her dead children were shown to jurors, she showed no emotion as the tape was played.

Dr. Patricia J. Moore, a medical examiner who performed autopsies on John and Mary, testified the children's heads had small bruises, likely from someone holding them under water.

Moore said John had a long brown hair, likely one of his mother's, clutched in his fist.