Officers say they believe the owner was planning to sell their babies.
Police are now trying to contact the girls' parents to reunite the families.
It is not the first time Nigerian authorities have uncovered a so-called baby factory.
In May, police in the state of Abia freed 32 pregnant girls who were forced to bear children.
The UN says human trafficking is the third-most common crime in Nigeria after economic fraud and drug trafficking
http://www.abc.net.au/news/2011-10-16/police-arrest-orphanage-owner/3573624
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