“The child was saved because it was in a crib and wrapped warmly,” regional governor Boris Dubrovsky was quoted as saying by the Interfax news agency.
Rescue crews had temporarily halted their search while workers tried to remove or stabilize sections of the building in danger of collapse.
Five people were hospitalized with injuries from the collapse in the city about 1,400 kilometres southeast of Moscow, the emergency ministry said.
In a separate holiday-period disaster, seven people including a couple and their three children died in a house fire in in the town of Orsk, about 1500 kilometres southeast of Moscow, the Interfax news agency said. The fire early Tuesday is believed to have been caused by an electrical short-circuit, the report said.