As authorities in Upper Darby, Pennsylvania, search for a man captured on a home surveillance camera carrying a toddler in his arms as he allegedly steals a package off someone's porch, consumers are being reminded about the risks of shipping packages this holiday season.

"The thing that bothers me about this one is the little baby," Upper Darby Police Superintendent Michael Chitwood told ABC News affiliate WPVI about the surveillance tape. "He never lets go and uses the baby as a cover to steal."

In the video released Tuesday, a UPS driver can be seen knocking on the neighbor's door and then leaving the package on the porch, as instructed by the homeowner. The box reportedly was full of toys for the holiday.

Minutes later, after the UPS driver leaves, the man holding a toddler in one arm walks up to the porch and allegedly steals the box.

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Chitwood said the delivery drivers were just doing their jobs.

"They knock on the door. Nobody's home. They leave the package," he said. "These bums are perusing the neighborhood and … they follow the trucks."

With the U.S. Postal Service, UPS and FedEx expected to deliver nearly 1.3 billion packages between Thanksgiving and Christmas this year - 10 percent more than last year - consumers should be on alert, experts say.

Delivery companies told ABC News that they trained their drivers to be highly alert to possible thieves but police said consumers should be on alert too.

Police said home security cameras like the ones in Upper Darby have also been key in helping the authorities identify alleged thieves.