It is currently taking more than 12 months for this type of case.
Talk to an attorney about K-3/K-4 options.
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Unfortunately, your case is not outside normal processing times. USCIS is backlogged with family-based immigrant visa petitions. Per a recent phone call with USCIS is currently processing such cases filed in October 2012. It could take another 6 months before you receive anything further.
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This is normal and within the expected processing time. Be patient. You should hear something within the coming months.
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My colleagues have addressed your timing question well. However, my curiosity was peaked becauase you indicate that you filed "the" I-130 petition with USCIS. Does this mean you only filed one petition? If so, you are going to be extremely disappointed. There are no derivative beneficiaries of U.S. citizen (immediate relative) petitions. Each person must have his or her own petition.
I suggest you consult with an experienced immigration attorney. Once the petitions are approved you are still looking at another 3-5 months before your family will arrive in the U.S.
While this answer is provided by a Florida Bar Certified Expert in Immigration and Nationality Law, it is for general information purposes only and an attorney/client relationship is neither intended nor created. You should seek out qualified counsel to review your case and provide you with advice specific to your situation. Review Mr. Devore's Avvo Profile for more information about his expertise in immigration law and how to contact him to discuss your case.