Expert: There is still hope for missing baby Lisa Irwin

(CBS) NEW YORK - As a new timeline of the family's version of the events leading up to the disappearance of Kansas City infant Lisa Irwin from her home on October 4 emerges, the President of the National Center for Missing and Exploited Children (NCMEC) tells Crimesider that according to statistics on abducted children, the Irwins are more likely than not to see their baby girl again.

Lisa Irwin: Timeline
Baby Lisa Pictures

According to Ernie Allen, each year in the U.S., there are approximately 115 "stereotypical kidnappings." Of those, Allen says, 56 percent come home alive.

"We think there is real hope for Lisa," says Allen. "You'll often hear that if a child isn't found in a day or a week or a month then there is no hope, but it's just not true."

Particularly in the case of infant abductions, Allen says, the intent of the kidnapping usually isn't to kill or hurt the child, but actually to take care of him or her.

Lisa's parents have said that they discovered Lisa was missing when her father checked on the baby more than five hours after Lisa's mother put her to bed. Authorities have speculated that someone entered through a bedroom window and snatched the baby from her bed as she was sleeping.

"The typical infant abductor is a woman who lost a child and is emotionally disturbed," he says.

"You have to look at the parents," he says. "The problem is that when people in the community think the parents did it, they stop paying attention. But somebody out there knows something. Somebody has seen something."

Complete Coverage of Lisa Irwin on Crimesider