The newborn was found by five teenagers in an egg box on a remote road near the village of Sosnovka outside Novosibirsk on Friday, local reports say.
The baby girl was rushed to hospital by one of the teenagers' parents where she was declared fit and well.
Police looking for the mother have opened a criminal investigation into the attempted murder of a minor.
The parents of one of the teenagers who found the baby wish to adopt her but must wait to see whether her relatives can be found.
