Hi! I went to USA on F2 visa. During my stay there I changed my status from F2 to F1. I completed my study and had baby. I came to my home country.

Your having changed status from F-2 to F-1 is only valid when you are in the US. If you are out of the country and coming back in as a dependent rather than a student, the F-2 visa is the correct one under which to enter as long as the principal F-1 is still in valid student status. That appears to be your case.Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.