Missing Baby Lisa: FBI and Police Search Landfill

Baby Lisa's Parents Insist They Are Still Cooperating

They were trying to remember if anyone ever took particular interest in their little girl who was last seen by Bradley on Monday night when she put Lisa to bed at the family home.

Little by little, details have emerged about the mysterious events of Monday night.

The parents revealed that their cell phones were missing when they frantically tried to call 911 after discovering that their "Pumpkin Pie" was not in her crib.

"The windows were open and lights were on and she was nowhere to be found," Irwin told "Good Morning America" Thursday. "We've been going over everything in our minds. We just don't have any idea."

Irwin said that his front door was unlocked when he returned home from work as an electrician at 4 a.m. to find his daughter missing.

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Lisa Irwin was last seen around 10:30 p.m.... View Full Size

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Lisa Irwin was last seen around 10:30 p.m. Monday, Oct. 3, 2011, when her mother put her to bed.

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Irwin said that this was the first night he had ever worked the overnight shift and Bradley said it was the first night she had ever left the door unlocked.

Bradley also described to "Good Morning America" how two other children from previous relationships who live in the house have been handling the situation.

"They were crying and asking where [Lisa] was," Bradley said through tears. "My 8-year-old, who's usually really strong, he kind of fell apart. We call her Pumpkin Pie and he said, 'Where's Pumpkin Pie, Mom?' And I couldn't tell him."

"Please. She has a family who loves her very much," Bradley cried. "Take her somewhere safe. Take her to a church, a hospital, a fire department. Just drop her off with somebody and then leave, no questions asked. We just want our baby back."

Ernie Allen of the National Center for Missing and Exploited Children said that infant abduction cases are relatively rare. There have been 278 documented cases in which newborns or infants have been abducted since 1983.

Anyone with information on Lisa's disappearance should call the Kansas City Police Department hotline at 816-474-TIPS.

ABC News' Dan Harris and Michael S. James contributed to this report.