GALVESTON, Texas -- A man convicted of putting his baby in a microwave was sentenced to 25 years in prison on Wednesday.

Joshua Mauldin, 20, was found guilty of felony injury to a child Tuesday morning. He put his 2-month-old daughter, Ana Murphy, in a Galveston motel microwave and turned it on for 10 to 20 seconds in May.

Houston TV station KPRC reported that Mauldin faced a sentencing range from probation to 99 years in prison. Prosecutors asked for the maximum sentence.

In addition to the prison sentence, Mauldin was fined $10,000.

He pleaded not guilty by reason of insanity.

Jurors began deliberating punishment shortly after 3:15 p.m. on Tuesday. A verdict was reached at about 2:30 p.m. on Wednesday.

Mauldin was teary-eyed after hearing the sentence. His mother, Joanie, loudly sobbed in the courtroom after the verdict was read.

During the punishment phase, Heather Croxton tearfully described how she cares for and loves Ana as her foster mother.

"I can only imagine how that would feel -- to know that the man who was supposed to take care of her did this to her," she said.

She described Ana's wounds, and the painful process to clean them and administer medication. Ana has silicone adhesives on her facial burns.

"The scar tissue and skin grafts -- as she grows, they become tight. They have to be released. So, she will always need to go to Shriners," Croxton said. "She can't spread her fingers out, so she has like a ball."

Ana suffered second- and third-degree burns to her left ear, cheek, hand and shoulder and required two skin grafts. Part of her left ear had to be amputated.

Defense attorneys said Mauldin loves his daughter but had a psychotic episode. Doctors testified that Mauldin had a history of mental illness and was diagnosed with a major depressive disorder three weeks before the baby was hurt.

Ana, who recently turned 1 year old, has undergone several surgeries. She faces more surgeries and will probably have future medical problems, according to doctors.

She has no contact with her parents or paternal grandmother.

A trial to terminate the Mauldins' parental rights is scheduled for April.

Eva Mauldin refused defense attorneys' requests to testify and lives in Arkansas.