You do not tell us whether you were married to the child's mother at the time the child was born, or whether you have been legally determined to be the father of the child. If there is a Court Order tat grants custody of the child to the mother, you might be able to file a Motion to Modify that Order. If there is no such Order then you might be able to file a suit seeking a determination of paternity and an award of custody. These things take anywhere from several weeks to several months. I would advise you to consult with and hire an attorney.
Answered on Jul 28th, 2011 at 12:37 PM