A few things:
First: your profile shows you as just being approved as a Lawful Permanent Resident, this is different than being a Citizen. In order for you to apply for a visa for a IR visa for a child under 21 you first need to be a US Citizen. You would be filing a second pref visa.
QUOTE
Family Second Preference (F2): Spouses, minor children, and unmarried sons and daughters (over age 20) of lawful permanent residents. (114,200) At least seventy-seven percent of all visas available for this category will go to the spouses and children; the remainder will be allocated to unmarried sons and daughters.
http://travel.state.gov/visa/immigrants/ty...types_1306.htmlYou can file at any time, though the wait time for a visa number can be 2-4 years.
You would first need to obtain Citizenship through Naturalization, (3 years from now) before you can petition for child as an immediate relative.
If you did list your child on the I-129F petition you may be able to bring him here on a K-2 visa. (follow to join)
QUOTE
Children Have Derivative Status
The child of a fiancé(e) may receive a derivative K-2 visa from his/her parent’s fiancé(e) petition. You, the American citizen petitioner, must make sure that you name the child in the I-129F petition. After the marriage of the child’s parent and the American citizen, the child will need a separate form I-485 Application to Register Permanent Residence or to Adjust Status. The child may travel with (accompany) the K-1 parent/fiancé(e) or travel later (follow-to-join) within one year from the date of issuance of the K-1 visa to his/her parent. A separate petition is not required if the children accompany or follow the alien fiancé(e) within one year from the date of issuance of the K-1 visa. If it is long than one year from the date of visa issuance, a separate immigrant visa petition is required.
Remember that in immigration law a child must be unmarried. The stepparent/stepchild relationship must be created before the child reaches the age of 18.
http://travel.state.gov/visa/immigrants/ty...4.html#Children
