Hello i am LPR and i have filed i-130 for my wife (she leaves in different country) in October 2012 in February 2013 my son was born, so i am wondering when the time comes can we use follow to join benefit for my son?and what kind of documents i need,what is this process look like,thank you

Please see these two links from USCIS and Manila US Embassy http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b9ac89243c6a7543f6d1a/?vgnextoid=86493e4d77d73210VgnVCM100000082ca60aRCRD&vgnextchannel=86493e4d77d73210VgnVCM100000082ca60aRCRD http://manila.usembassy.gov/follow-to-join.html